package test;

import java.math.BigInteger;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class MyTest {

    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);

        int n = in.nextInt();

        List<Integer> result = new ArrayList<Integer>();

        int carry = 0;

        int digit = 1;

        int temp = 1;

        int i,j;

        result.add(1);

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

            for(j = 0,carry = 0;j<digit;j++){

                temp = result.get(j)*i+carry;

                result.set(j, temp%10000);

                carry  = temp/10000;

            }

            while(carry != 0){

                result.add(digit++, carry%10000);

                carry/=10000;

            }

        }

        int count = 1;

        System.out.print(result.get(digit-1));

        for(i = digit-1;i>=1;i--){

            count++;

            if(result.get(i-1)<10){

                System.out.print("000");

            }else if(result.get(i-1)<100){

                System.out.print("00");

            }else if(result.get(i-1)<1000){

                System.out.print("0");

            }

            System.out.print(result.get(i-1));

        }

    }

}