n = int(input())
mod = 10**12

def count_five(n):
    count = 0
    while n > 0:
        n = n // 5
        count += n
    return count

if count_five(n) >= 12:
    print(0)
else:
    result = 1
    for i in range(1, n + 1):
        result = (result * i) % mod
    print(result)