
import java.util.Scanner;

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

import java.util.Scanner;

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