/* package codechef; // don't place package name! */

import java.util.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
public class Main {
    public static void main (String[] args) {
        // your code goes here
        Scanner s = new Scanner(System.in);
        int j = 0;
        for(int i=0; i<5; i++)
        {
            int x = s.nextInt();
            if(x==0)
                j=i+1;
        }
        System.out.println(j);

    }
}

/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