#include <bits/stdc++.h>
using namespace std;
const float pi = 3.14;

bool checkInt(double n){return (int)n == n;}
void print(double n){cout<<setprecision(2)<<fixed<<n<<endl;}
int main(){
    float a,b;cin>>a>>b;
    double acrea_sq = a*b,acrea_cir = (pi*a*a)/4,acrea_oth = acrea_sq-acrea_cir;
    if (checkInt(acrea_sq)) cout<<(int)acrea_sq<<endl;
    else print(acrea_sq);

    if (checkInt(acrea_cir))cout<<(int)acrea_cir<<endl;
    else print(acrea_cir);

    if (checkInt(acrea_oth))cout<<(int)acrea_oth<<endl;
    else print(acrea_oth);

}