import sys

n = int(input())
if n >= 50:
    print("%012d" % 0)
    sys.exit()

mod = int(1e12)

ans = 1
full_digit = False
for i in range(1, n+1):
    ans *= i
    if ans / mod > 1:
        full_digit = True
    ans %= mod

if full_digit:
    print("%012d" % ans)
else:
    print(ans)