HDU—OJ 、2009

package eleven_page;

import java.util.Scanner;
//注意submit的时候要把类名改为Main,否则会CE,得不到AC。
public class Series_And {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            int n = scanner.nextInt();
            int m = scanner.nextInt();
            double sum = 0;
            double xin = n;
            while (m != 1) {
                double old = Math.sqrt(xin);
                sum = sum + old;
                xin = old;
                m--;
            }
            System.out.println(String.format("%.2f", sum + n));
        }
    }

}