#include <stdio.h>

int a, b, c;

int main(void) {
	scanf("%d%d%d", &a, &b, &c);
	double d = a / b + !!(a % b);
	double e = a / c + !!(a % c);
	printf("%s\n", e <= (d * 2 / 3) ? "YES" : "NO" );
	return 0;
}