n = int(input())
if n < 50:
    f = 1
    for n in range(1, 100):
        f *= n
        f %= 10**12
    if n <= 14:
        print(f)
    else:
        fs = str(f)
        fs = '0' * (12 - len(fs)) + fs
        print(fs)
else:
    print('0'*12)