杭电oj 2009 java

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import java.util.Scanner;
class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner read = new Scanner(System.in);
        while(read.hasNextInt() || read.hasNextDouble()) {
            double num = read.nextDouble();
            int count = read.nextInt();
            double res = num;
            count--;
            while(count-- > 0) {
                num = Math.sqrt(num);
                res+= num;
            }
            System.out.printf("%.2f",res);
            System.out.println();
        }
        read.close();
    }

}