import sys
sys.setrecursionlimit(10**6)
from functools import lru_cache

@lru_cache(maxsize=None)
def factorial(n, mod=10**9 + 7):
    '''n! % mod'''
    if n == 0:
        return 1
    return (n * factorial(n-1, mod)) % mod

print(factorial(int(input())))