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