import java.util.Scanner;

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