import java.util.Scanner;

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


