#include"iostream"

using namespace std;

int main()

{

	int n, digit, carry, tmp;

	int a[40000];

	while(cin>>n)

	{

		if(n <= 1)

		{

			cout<<1<<endl;

		}

		else

		{

			a[0] = 1;

			digit = 1;

			for(int i = 2; i <= n; i++)

			{

				carry = 0;

				for(int j = 0; j < digit; j++)

				{

					tmp = a[j] * i + carry;

					a[j] = tmp % 10;

					carry = tmp / 10;

				}

				while(carry > 0)

				{

					a[digit] = carry % 10;

					digit++;

					carry /= 10;

				}

			}

			for(int j = digit - 1; j >= 0; j--)

			{

					cout<<a[j];

			}

			cout<<endl;

		}

	}

    return 0;

}