import java.util.Scanner;

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

        int number1 = Integer.parseInt(console.nextLine());
        int number2 = Integer.parseInt(console.nextLine());
        int number3 = Integer.parseInt(console.nextLine());

        if(number1 == number2){
            System.out.println("yes");
        }else if(number2 == number3){
            System.out.println("yes");
        }else if(number1 == number3){
            System.out.println("yes");
        }
        if(number1 != number2){
            System.out.println("no");
        }else if(number2 != number3){
            System.out.println("no");
        }else if(number1 != number3){
            System.out.println("no");
        }
    }
}