import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(read())

fact = [1] * 1000
for n in range(1,1000):
    fact[n] = fact[n-1] * n

if N >= 1000:
    answer = 0
else:
    answer = fact[N]
print(answer % (10**12))