#include <cstdio>

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

  int b_num = a / b;
  if (a % b) b_num++;

  int c_num = a / c;
  if (a % c) c_num++;

  if ((b_num * 2) / 3 >= c_num) {
    printf("YES\n");
  } else {
    printf("NO\n");
  }

  return 0;
}