import java.text.DecimalFormat;import java.util.Scanner;public class Main{		public static void main(String args[]){		Scanner scan = new Scanner(System.in);		DecimalFormat df = new DecimalFormat("0.00"); 		while(scan.hasNext()){			String str[] = scan.nextLine().split(" ");			double num = Double.parseDouble(str[0]);			int m = Integer.parseInt(str[1]);			double sum = num;						for(int i=1; i<m; ++i)			{				sum += Math.sqrt(num);				num = Math.sqrt(num);			}			System.out.PRintln(df.format(sum));		}	}}