/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static int factorial(int number) {
		System.out.println("N: " + number);
	    if(number <= 1) {
	        return 1;
	    }
	    System.out.println("R: " + number * factorial(number-1));
	    return number * factorial(number-1);
 
	}
 
	public static void main(String[] args) {
		System.out.println(factorial(4));  
	}
}

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