import java.util.Scanner;
 
   class Factorial {
 
    public static long factorial(int n) {
        long result = 1;
 
        if (n < 0) {
            return 1;
        }
 
        for (int i = 2; i <= n; i++) {
            result *= i;
        }
 
        return result;
    }
 
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter an integer n: ");
 
        int n = scanner.nextInt();
        scanner.close();
 
        System.out.println("Output: " + factorial(n)); 
    }
}

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