diff --git a/src/Test.java b/src/Test.java
index d525581..d338549 100644
--- a/src/Test.java
+++ b/src/Test.java
@@ -61,6 +61,15 @@ public class Test {
 
         plot(Database.Screw, "screws", 100, de);
         plot(Database.ReinforcedIronPlate, "ReinforcedIronPlate", 100, de);
+        Graph<Item, DefaultWeightedEdge> reif = Database.ReinforcedIronPlate.getRecipe().buildGraph(Database.ReinforcedIronPlate);
+        de.exportGraph(reif, new File("ReinforcedIronPlate_raw.dot"));
+        System.out.println("\nSUM_reif");
+        Database.ReinforcedIronPlate.getRecipe().sum(Database.ReinforcedIronPlate, 100);
+        System.out.println("\nSUM_screw");
+        Database.Screw.getRecipe().sum(Database.Screw, 100);
+        System.out.println("\nSUM_ACU");
+        Database.AdaptiveControlUnit.getRecipe().sum(Database.AdaptiveControlUnit, 100);
+
     }
 
     private static void plot(Item target, String name, int amount, DOTExporter<Item, DefaultWeightedEdge> de) {
diff --git a/src/items/Item.java b/src/items/Item.java
index dd7cb5f..6a52e91 100644
--- a/src/items/Item.java
+++ b/src/items/Item.java
@@ -81,7 +81,7 @@ public abstract class Item {
     public String toString() {
         return "Item{" +
                 "name='" + name + '\'' +
-                ", recipes=" + recipes +
+                ", #recipes=" + recipes.size() +
                 '}';
     }
 
@@ -115,4 +115,7 @@ public abstract class Item {
         return map;
     }
 
+    public  Graph<Item, DefaultWeightedEdge> hierarchy(){
+        return getRecipe().buildGraph(this);
+    }
 }
diff --git a/src/items/Recipe.java b/src/items/Recipe.java
index ee6d6af..8da86aa 100644
--- a/src/items/Recipe.java
+++ b/src/items/Recipe.java
@@ -8,15 +8,17 @@ import org.jgrapht.graph.DefaultDirectedWeightedGraph;
 import org.jgrapht.graph.DefaultWeightedEdge;
 
 import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.Map;
+import java.util.Queue;
 import java.util.stream.Collectors;
 
 public class Recipe {
-    private Map<Item, Integer> inputs;
-    private Map<Item, Integer> outputs;
+    private final Map<Item, Integer> inputs;
+    private final Map<Item, Integer> outputs;
     private boolean isHandCraftable = true;
     private String name;
-    private int duration;
+    private final int duration;
 
     public Recipe(int duration) {
         inputs = new HashMap<>();
@@ -92,9 +94,9 @@ public class Recipe {
     public Map<Item, Integer> getTotalRequirements() {
         return new TotalAccumulator(inputs).accumulate();
     }
+
     public float getProductionRate(Item item) {
-        Integer integer = outputs.get(item);
-        float production = integer;
+        float production = outputs.get(item);
         return production / duration;
     }
 
@@ -161,7 +163,7 @@ public class Recipe {
         inputs.forEach((item, integer) -> {
             graph.addVertex(item);
             graph.addEdge(item, target);
-            float rate = (amountPerSecond / outputs.get(target))/integer;
+            float rate = (amountPerSecond / outputs.get(target)) / integer;
             graph.setEdgeWeight(item, target, rate);
 
             Recipe recipe = item.getRecipe();
@@ -175,4 +177,41 @@ public class Recipe {
         return graph;
     }
 
+    public Map<Item, Double> sum(Item target, int prodPerMinute) {
+        Graph<Item, DefaultWeightedEdge> buildGraph = buildGraph(target);
+        Map<Item, Double> map = new HashMap<>();
+        Queue<Item> queue = new LinkedList<>();
+        queue.add(target);
+        map.put(target, (double) prodPerMinute);
+        while (!queue.isEmpty()) {
+            Item item = queue.remove();
+            // next items
+            buildGraph.incomingEdgesOf(item)
+                    .stream()
+                    .map(buildGraph::getEdgeSource)
+                    .forEach(queue::add);
+            // *this* item
+            double sum = 0;
+            for (DefaultWeightedEdge edge : buildGraph.outgoingEdgesOf(item)) {
+                Item product = buildGraph.getEdgeTarget(edge);
+                Double productWantedPerMinute = map.get(product);
+                if (productWantedPerMinute == null) {
+                    sum = 0;
+                    break;
+                }
+                double amountNeeded = buildGraph.getEdgeWeight(edge);
+                int productPerProcess = product.getRecipe().outputs.get(product);
+                double requiredProcesRuns = productWantedPerMinute / productPerProcess;
+                double requiredInput = amountNeeded * requiredProcesRuns;
+                sum += requiredInput;
+            }
+            if (!map.containsKey(item) && sum > 0) {
+                map.put(item, sum);
+            }
+        }
+        map.forEach((item, aDouble) -> {
+            System.out.println(item.getName() + ": " + aDouble);
+        });
+        return map;
+    }
 }
diff --git a/src/items/Utils.java b/src/items/Utils.java
index 08c2250..477d063 100644
--- a/src/items/Utils.java
+++ b/src/items/Utils.java
@@ -23,17 +23,18 @@ public class Utils {
         return raws;
     }
 
-    public static <E extends Number> Map<String, E> shorten(Map<Item, E> totals){
+    public static <E extends Number> Map<String, E> shorten(Map<Item, E> totals) {
         Map<String, E> shortend = new HashMap<>();
         totals.forEach((item, e) -> shortend.put(item.getName(), e));
         return shortend;
     }
 
-    public static String dotID(Item item){
-        String name = item.getName() +"_"+item.sum+"__"+(String.valueOf(item.getProductionRate()).replace(".","_"));
-        name = name.replace(" ","").replace(".","");
+    public static String dotID(Item item) {
+        String name = item.getName() + "_" + item.sum + "__" + (String.valueOf(item.getProductionRate()).replace(".", "_"));
+        name = name.replace(" ", "").replace(".", "");
         return name;
     }
+
     public static void fixSums(Item target, Graph<Item, DefaultWeightedEdge> graph) {
         System.err.println(target);
         EdgeReversedGraph<Item, DefaultWeightedEdge> inverse = new EdgeReversedGraph<>(graph);
@@ -69,9 +70,10 @@ public class Utils {
 
             }
         });
-        while (iterator.hasNext()){
+        while (iterator.hasNext()) {
             Item i = iterator.next();
             System.out.println(i.getName());
         }
     }
+
 }
diff --git a/src/test/java/items/ItemTest.java b/src/test/java/items/ItemTest.java
index b522334..5e28660 100644
--- a/src/test/java/items/ItemTest.java
+++ b/src/test/java/items/ItemTest.java
@@ -4,7 +4,7 @@ import org.junit.jupiter.api.Test;
 
 import java.util.Map;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 class ItemTest {
 
@@ -17,6 +17,15 @@ class ItemTest {
         assertEquals(25, production.get(Database.IronOre), "IronOre");
     }
 
+    @Test
+    void productionScrews2() {
+        Map<Item, Double> production = Database.Screw.getRecipe().sum(Database.Screw, 100);
+        assertEquals(100, production.get(Database.Screw), "Screws (output)");
+        assertEquals(25, production.get(Database.IronRod), "IronRod");
+        assertEquals(25, production.get(Database.IronIngot), "IronIngot");
+        assertEquals(25, production.get(Database.IronOre), "IronOre");
+    }
+
     @Test
     void productionReinforcedIronPlates() {
         Map<Item, Double> production = Database.ReinforcedIronPlate.production(100);