#include<iostream>
using namespace::std;
int calc(int x,int y);

int main(){
  int a,b,c;
  cin >> a >> b >> c;
  int calc1,calc2;
  calc1 = calc(a,b);
  calc2 = calc(a,c);
  if(calc2 <= calc1 * 2 / 3){
    cout << "YES\n";
  }
  else{
    cout << "NO\n";
  }
  return 0;
}

int calc(int x,int y){
  int z;
  if(x%y == 0){
    z = x / y;
  }
  else{
    z = (x / y) + 1;
  }
  return z;
}