using System;
public class Program
{
public static void Main()
Console.WriteLine("Hello World");
}
public int PivotIndex(int[] nums) {
int sum=0;int lsum=0;
for(int i=0;i<=nums.Length-1;i++)
sum=sum+nums[i];
for(int i =0;i<=nums.Length-1;i++)
if(lsum==sum-nums[i]-lsum)
return i;
lsum=lsum+nums[i];
return -1;