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import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Solution {

static int factorial(int n) {

// Complete this function

if(n<=1) {

return 1;

} else {

return n*factorial(n-1);

}

}

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

int n = in.nextInt();

int result = factorial(n);

System.out.println(result);

}

}