为啥只有30分？

import java.io.*;
import java.util.*;
public class Main {
    public static void main(String args[]) throws Exception {
        Scanner cin=new Scanner(System.in);
        int x = cin.nextInt(), n = cin.nextInt(),infected=1;
        while(n>0){
            infected+=x*infected;
            n--;
        }
        System.out.println(infected);
    }
}