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

def main():
    import sys
    MOD = 10**12
    N = int(sys.stdin.readline())
    z = compute_trailing_zeros(N)
    if z >= 12:
        print("000000000000")
        return
    
    product = 1
    count_2 = 0
    count_5 = 0
    
    for i in range(1, N+1):
        num = i
        while num % 2 == 0:
            num //= 2
            count_2 += 1
        while num % 5 == 0:
            num //= 5
            count_5 += 1
        product = (product * num) % MOD
    
    excess_2 = count_2 - count_5
    pow_2 = pow(2, excess_2, MOD)
    product = (product * pow_2) % MOD
    
    pow_10_z = pow(10, z, MOD)
    result = (product * pow_10_z) % MOD
    
    if result == 0:
        print("000000000000")
    else:
        print(result)

if __name__ == "__main__":
    main()