import java.util.Scanner;
public class Main {
public static int factorial(int input) {
if (input <= 1)
return 1;
return input * factorial(input - 1);
}
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
int input = in.nextInt();
int sum = factorial(input);
System.out.println(sum);
}
}
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