/**
* 数列的和
* 数列的第一项为n，以后各项为前一项的平方根，求数列的前m项的和
*/
import java.util.Scanner;
public class acm2009 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while(in.hasNextInt()){
int firstNum = in.nextInt();
int lastNum = in.nextInt();
double sum= firstNum;
double tmp= firstNum;
for(int i = 0 ; i < lastNum-1 ;i++){
tmp = Math.sqrt(tmp);
sum += tmp;
}
System.out.printf("%.2f",sum);
System.out.println();
}
}
}
acm2009
原文：http://blog.csdn.net/a736933735/article/details/43865781
