#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: zhengzihao
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/