#include <cstdio>
#include <climits>
#include <vector>
#include <algorithm>
#include <queue>
#include <stdio.h>
#include <string>


#define REP(i,n) for(int i=0;i<(int)n;++i)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define ALL(c) (c).begin(), (c).end()
#define INF 99999999

using namespace std;

int main() {
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    
    int as = ((a%b)!=0?1:0) + (a/b);
    int bs = ((a%c)!=0?1:0) + (a/c);
    
    
    if(as * 2 / 3.0 >= bs) {
        printf("YES\n");
    }
    else {
        printf("NO\n");
    }
    
    
    
    
    
    
    
    
    
    
}