import java.io.*;

public class Factorial {

  public static int getFactorial(int n) {
    int fact = 1;
    if(n == 0) {
      fact = fact;
    } else {
       for(int i = n; i > 1; i--) {
        fact = fact*i;
      }
    } 
    return fact;
  }

  public static void main(String argv[]) throws Exception {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Enter a number: ");
    String s = br.readLine();
    int n = Integer.parseInt(s);
    int fact = getFactorial(n);
    System.out.println("The factorial of " + n + " is: " + fact);
  }
}