diff --git a/src/Traverse.java b/src/Traverse.java
index 7945513..22cfca6 100644
--- a/src/Traverse.java
+++ b/src/Traverse.java
@@ -28,6 +28,50 @@ public static void main(String[] args) {
     v45.neighbors = new ArrayList<>(List.of(v23));
     v23.neighbors = new ArrayList<>(List.of());
     v67.neighbors = new ArrayList<>(List.of(v91));
+
+
+    //traverse(v3);
+    int result = sum(v45);
+    System.out.println(result);
+   
+  }
+
+  public static int sum(Vertex<Integer> current) {
+    Set<Vertex<Integer>> visited = new HashSet<>();
+    return sum(current, visited); 
+  }
+
+  public static int sum(Vertex<Integer> current, Set<Vertex<Integer>> visited) {
+    if(current == null || visited.contains(current)) return 0;
+    visited.add(current);
+    int total = 0;
+
+    total += current.data;
+    for(Vertex<Integer>neighbor : current.neighbors)
+    {
+      int neighborSum = sum(neighbor, visited);
+      total += neighborSum;
+    }
+    return total;
+    
+  }
+
+
+  
+  public static <T> void traverse(Vertex<T> current) {   
+    Set<Vertex<T>> visited = new HashSet<>();
+    traverse(current, visited);
+  }
+  
+  public static <T> void traverse(Vertex<T> current, Set<Vertex<T>> visited) {   
+    if(current == null || visited.contains(current)) return;
+    
+    System.out.println(current.data);
+    visited.add(current);
+  
+    for(Vertex<T> neighbor : current.neighbors) {
+      traverse(neighbor, visited);
+    }
   }
 
 }