import java.util.Scanner;

import static java.lang.Math.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt(), s = sc.nextInt(), ans = 0;

        for (int i = 1; i < n; i++)
            ans += sc.nextInt() != s ? 1 : 0;

        System.out.println(ans == 0);
    }
}