#include<bits/stdc++.h>
using namespace std;
int main(){
    float m,z,r,h,g; 
	cin>>r>>h;
    m=3.1415926*r*r;
    z=3.1415926*2*r;
    g=m*2+z*h;
    printf("%.2f",g);
}
/**************************************************************
	Problem: 1623
	User: wangyiyang
	Language: C++
	Result: Wrong Answer
****************************************************************/