#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,c,b;
    cin>>a>>b>>c;
    if(a<b&&b<c){
        cout<<"yes";
    }else{
        cout<<"no";
    }
} 
/**************************************************************
	Problem: 1036
	User: wangchenyu
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/