import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	} main {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int ans = 0; ans 0 for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		} int i=1; int i=1; i 1 i<=5 i 5 i++ i++ i {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		} {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		} if (0 == sc.nextInt()) {
				ans = i;
				break;
			} 0 == sc.nextInt() 0 sc.nextInt() sc.nextInt sc {
				ans = i;
				break;
			} ans = i ans i break; System.out.println(ans) System.out.println System.out System System.out ans sc.close() sc.close sc String[] args args public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	}

} Main
import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int ans = 0;
		for (int i=1; i<=5; i++) {
			if (0 == sc.nextInt()) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);
		sc.close();
	}

}