/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Pollock
 */
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int a[] = new int[5];
        for (int i = 0; i < a.length; i++) {
            a[i] = sc.nextInt();
        }
        int idx = 0;
        for (int i = 0; i < a.length; i++) {
            if (a[i] == 0) {
                idx = i;
            }
        }
            System.out.println(idx + 1);
        }
    }


/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz