/*package whatever //do not write package name here */

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

class Main {
	public static void main (String[] args) {
	    Scanner in = new Scanner(System.in);
	   for(int i=1 ; i<= 5 ; i++) {
	       int num = in.nextInt();
	       if(num == 0)
	       System.out.println(i);
	   }
	}
}
/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