import java.util.*;

public class Main {
    public static void main(String[] args) {
      Scanner s = new Scanner(System.in);
        List<String> xList = new ArrayList<String>();
        for (int i = 0 ; i < 5 ;i++) {
            xList.add(s.next());
        }
        System.out.println(xList.indexOf("0") + 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