Sum of Path Numbers (medium)

import java.util.*;
class TreeNode {
  int val;
  TreeNode left;
  TreeNode right;
  TreeNode(int x) {
    val = x;
  }
};
class SumOfPathNumbers {
  public static int findSumOfPathNumbers(TreeNode root) {
    // TODO: Write your code here
    return -1;
  }
  public static void main(String[] args) {
    TreeNode root = new TreeNode(1);
    root.left = new TreeNode(0);
    root.right = new TreeNode(1);
    root.left.left = new TreeNode(1);
    root.right.left = new TreeNode(6);
    root.right.right = new TreeNode(5);
    System.out.println("Total Sum of Path Numbers: " + SumOfPathNumbers.findSumOfPathNumbers(root));
  }
}