from fractions import Fraction
from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
println = stdout.write

def main():
    A, B, C = (int(input()) for _ in [0] * 3)

    cost1 = -(-A // B)
    cost2 = -(-A // C)
    if Fraction(cost2, cost1) <= Fraction(2, 3):
        println('YES\n')
    else:
        println('NO\n')

main()