import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    a = 1
    n = int(input())
    for i in range(1, n+1):
        a = (a*i) % (10**12)
        if a == 0:
            break

    if a == 0:
        print('0'*12)
    else:
        print(a)


if __name__ == '__main__':
    main()