import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
Scanner sc=new Scanner(System.in);
int x=sc.nextInt();
if(x==0)
{
System.out.println("1");
return;
}
x=sc.nextInt();
if(x==0)
{
System.out.println("2");
return;
}
x=sc.nextInt();
if(x==0)
{
System.out.println("3");
return;
}
x=sc.nextInt();
if(x==0)
{
System.out.println("4");
return;
}
x=sc.nextInt();
if(x==0)
{
System.out.println("5");
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