#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <limits.h>
#include <vector>
#include <numeric>
using namespace std;

int main(){
    int a,b,c;
    int test1,test2;
    cin >> a >> b >> c;
    
    test1 = (a+b-1)/b;
    test2 = (a+c-1)/c;
    
    if(2.0 / 3.0  >= test2/test1){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
    
    return 0;
}