import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int[] x={1,2,3,4,5};
      int[] inx=new int[5];
      for(int i=0;i<5;i++){
         inx[i]=sc.nextInt();
      }
      for(int j=0;j<5;j++){
         if(inx[j]==0){
            System.out.println(x[j]);
         }
      }
   }
}

/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