N = int(input())
def kaijou(N):
    if N == 0:
        return 1
    return N * kaijou(N-1)

if N >= 50:
    print("000000000000")
elif N >= 15:
    a = kaijou(N) % (10**12)
    if len(str(a)) < 12:
        for i in range(12-len(str(a))):
            print("0",end="")
        print(a)
    else:
        print(a)
        
else:
    print(kaijou(N))