//Diffie-Hellman Key Exchange (Java)
import java.util.Scanner;

public class ex6 {
    static long power(int a, int b, int mod) {
        if (b == 1) return a;
        long t = power(a, b/2, mod);
        return (b%2==0) ? (t*t)%mod : ((t*t)%mod*a)%mod;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        int n = scanner.nextInt();
        int g = scanner.nextInt();
        int x = scanner.nextInt();
        int y = scanner.nextInt();
        
        System.out.println("Key Exchange Done");
        
        scanner.close();
    }
}