n, k, t = map(int, input().split())

"""
for i in range(k+1):
    d = i * k
    if d >= abs(n) and i <= t:
        print('Yes')
        break
else:
    print('No')
"""
a = n // k
b = n // k + 1

flg = True
if a * k > abs(n) and a <= t:
    flg = True
else:
    flg = False

flag = True
if b * k > abs(n) and b <= t:
    flag = True
else:
    flag = False

if flg or flag:
    print('Yes')
else:
    print('No')