EqualSums 1

import javax.swing.*;
import java.util.Scanner;

public class EqualSums {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);


        String[] input = scan.nextLine().split(" ");

        int[] numbers = new int[input.length];

        for (int i = 0; i < input.length; i++) {
            numbers[i] = Integer.parseInt(input[i]);
        }
        int count = numbers.length;
        int index = 0;
        boolean isEqual = false;

        while (count > 0) {
            int rightSum = 0;
            int leftSum = 0;


            for (int i = index; i < numbers.length - 1; i++) { // right sum
                rightSum += numbers[i + 1];
            }

            for (int i = index ; i > 0 ; i--) { // left sum
                leftSum += numbers[i - 1];
            }

            if (rightSum == leftSum) {
                isEqual = true;
                break;
            }

            index++;
            count--;
        }
        if (isEqual) {
            System.out.println(index);
        } else {
            System.out.println("no");
        }
    }
}