import java.util.*;

public class Main{
    public static void main(String[] args){

        Scanner scanner = new Scanner(System.in);

        for(int loop=0; loop<5; loop++) {
            int x = scanner.nextInt();
            if(x==0) {
                System.out.println( loop+1 );
                break;
            }
        }

    }
}
/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