#include <bits/stdc++.h>
using namespace std;
int x,y,t;
int main(){
    cin>>y>>x>>t;
    if(y>x){
        if(t<y&&t>=x){
            cout<<"Yes";
        }else{
            cout<<"No";
        }
    }else{
        if(t<y||t>=x){
            cout<<"Yes";
        }else{
            cout<<"No";
        }
    }
    return 0;
}