#include <bits/stdc++.h>
using namespace std;
int main() {
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    int s1=(a+b-1)/b,s2=(a+c-1)/c;
    if(s2*1.5<=s1) {
        printf("YES\n");
    }else {
        printf("NO\n");
    }
}