import java.util.*;
import java.io.*;
public class Main {
    public static void main(String[] args) throws Exception {       
        Scanner sc = new Scanner(System.in);
        for(int i=0;i<5;i++) {
            int k = sc.nextInt();
            if (k==0) {
                System.out.println(i+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