def factorial(x):
    if x == 0:
        return 1
    return x * factorial(x-1)

def solve(n):
    if n < 100:
        return factorial(n) % 1000000000000
    return 0

def main():
    n = int(input())
    ret = solve(n)
    if ret == 0:
        print("000000000000")
    else:
        print(ret)

if __name__ == '__main__':
    main()