Problem: Create a program that outputs the surface area S of a square cone with a height of h, with a square with one side x as the base. However, assume that the line segment connecting the apex and the center of the base is orthogonal to the base. Also, x and h are positive integers less than or equal to 100.

Input

Given multiple datasets. Each dataset is given in the following format:


x
h


When both x and h are 0, it indicates the end of input.



Output

Output S (real number) on one line for each data set. The output may contain an error of 0.00001 or less.

Example

Input

6
4
7
9
0
0


Output

96.000000
184.192455

Solution (in CPP):

Solution:
#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

double calc(int x, int h) {
    return((2.0 * x) * sqrt(h*h + (x*x) / 4.0) + x*x);
}

int main(void) {
    int x, h;
    
    while(cin >> x >> h, x||h) {
        printf("%.6f\n", calc(x, h));
    }
    return(0);
}