import java.util.*;

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