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import java.util.Scanner;

public class Factorial{

public static void main(String[] args){

Scanner input = new Scanner(System.in);

//Prompt user to enter integer

System.out.print("Enter a non-negative integer: ");

//Proceed with factorial calculation only if inputted number is not negative

if(input.hasNextInt()){

int number = input.nextInt();

if (number < 0){

System.out.print("Cannot execute. Please enter a non-negative integer: ");

number = input.nextInt();

} else {

//Output of factorial for any non-negative number

System.out.println("The factorial of "+number+" will yield: "+factorial(number));

}

}

}

//Factorial method

public static long factorial(int n){

if (n==0){

return 1;

} else if (n==1){

return 1;

} else {

return n * factorial(n-1);

}

}

}