answer = 1
target = int(input())
if target >= 50:
    print("000000000000")
else:
    for n in range(2,target + 1):
        answer *= n
        # print(n,answer % 1000000000000)
    if answer > 1000000000000:
        print(str(answer % 1000000000000).zfill(12))
    else:
        print(str(answer % 1000000000000))