from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

N = int(input())
mod = 10**12
tmp = 1
if N>=50:
    print('0'*12)
    exit()
for _ in range(1,N+1):
    tmp *= _
    tmp %= mod
print(tmp)