#include <stdio.h>

int main() {
  int a, b, c;
  scanf("%d %d %d", &a, &b, &c);

  int usu=(a+b-1)/b, camp=(a+c-1)/c;
  printf("%s\n", (double)camp/usu<=2.0/3.0 ? "YES": "NO");
  return 0;
}