

import java.util.Scanner;

public class Main {

    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int [] nums = new int[5];
        for(int i = 0 ; i< 5;i++){
        
        nums[i] = scanner.nextInt();
               }
        
         for(int i = 0 ; i< 5;i++){
         if(nums[i] == 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