# No.218 経験値1.5倍
a, b, c = [int(input()) for i in range(3)]

num_b = a // b if a % b == 0 else a // b + 1
num_c = a // c if a % c == 0 else a // c + 1

print('YES' if num_c <= num_b * 2 / 3 else 'NO')