#include<stdio.h>
int main()
{
	int a, b, c;
	scanf("%d%d%de", &a, &b, &c);
	if ((a + b - 1) / b * 2 < (a + c - 1) / c * 3)
		printf("NO\n");
	else
		printf("YES\n");
	return 0;
}