// Mason Marnell - Factorial
import static java.lang.System.in;
import java.util.Scanner;
public class SumOfDigits {
public static int sumDigits(int num){
if(num <= 1) return num;
return sumDigits(num-1) * num;
}
public static void main(String[] args) {
Scanner keyb = new Scanner(in);
System.out.println("Enter a factorial (without the !)");
int nm = keyb.nextInt();
System.out.println(sumDigits(nm));
}
}
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