def xxx(S):
    if len(S)>2:    return "000000000000"
    N =int(S)
    if N>49:        return "000000000000"
    n =N
    for i in range(N-1,1,-1):
        n =n*i%1000000000000
    s=str(n)
    if N<15:        return str(n)
    return "0"*(12-len(s))+s

S=input()
print(xxx(S))