import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    }
}
     import java.util.*; util.* java public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    }
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    } main {
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      } a==0 a 0 {
        System.out.println(1);
      } System.out.println(1) System.out.println System.out System System.out 1 if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      } b==0 b 0 {
        System.out.println(2);
      } System.out.println(2) System.out.println System.out System System.out 2 if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      } c==0 c 0 {
        System.out.println(3);
      } System.out.println(3) System.out.println System.out System System.out 3 if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      } d==0 d 0 {
        System.out.println(4);
      } System.out.println(4) System.out.println System.out System System.out 4 if(e==0){
        System.out.println(5);
      } e==0 e 0 {
        System.out.println(5);
      } System.out.println(5) System.out.println System.out System System.out 5 String[] args args public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    }
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    }
} Main
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a = sc.nextInt();
      int b = sc.nextInt();
      int c = sc.nextInt();
      int d = sc.nextInt();
      int e = sc.nextInt();
      if(a==0){
        System.out.println(1);
      }else if(b==0){
        System.out.println(2);
      }else if(c==0){
        System.out.println(3);
      }else if(d==0){
        System.out.println(4);
      }else if(e==0){
        System.out.println(5);
      }
    }
}
    