15. 3 Equal Numbers

/**
 * Project: Simple_Conditions - created by borkins on 2017-03-25.
 */

import java.util.Scanner;

public class _15_ThreeEqualNumbers
{
    public static void main(String[] args)
    {
        Scanner console = new Scanner(System.in);

        int a = Integer.parseInt(console.nextLine());
        int b = Integer.parseInt(console.nextLine());
        int c = Integer.parseInt(console.nextLine());

        System.out.println((a == b && a == c) ? "yes" : "no");
    }
}