N = int(input())
MOD = 10**12

count2 = 0
count5 = 0
rest = 1

for i in range(1, N + 1):
    x = i
    while x % 2 == 0:
        x //= 2
        count2 += 1
    while x % 5 == 0:
        x //= 5
        count5 += 1
    rest = (rest * x) % MOD

k = min(count2, count5)
count2 -= k
count5 -= k

rest = rest * pow(2, count2, MOD) % MOD
rest = rest * pow(5, count5, MOD) % MOD
rest = rest * pow(10, k, MOD) % MOD

print(f"{rest:012d}"[-12:])