import java.util.Scanner;


class Main{
    public static void main(String args[]){
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        int c = scan.nextInt();
        int d = 0;
        if(a==b){
            if(a<c){
                d = 1;
            }
        }
        else if(a==c){
            if(a<b){
                d = 1;
            }
        }
        else if(c==b){
            if(c<a){
                d = 1;
            }
        }
        
        if(d==1){
            System.out.println("YES"); 
        }
        else{
            System.out.println("NO"); 
        }
        scan.close();
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz