[백준] 팩토리얼

https://www.acmicpc.net/submit/10872

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import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
    
        in.close();
        int sum = factorial(N);
        System.out.println(sum);
    }// main end
    
    public static int factorial(int N){
        if(N<=1) return 1;
        return N*factorial(N-1);
    }// 재귀 end
    
}// class end