#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

#include <math.h>

int main() {
double c;
double ri,ro;
cin>>c;
cin>>ri>>ro;
cout<<pow(M_PI,2)<<endl;
cout<<pow(M_PI,2)/4<<endl;
printf("%.8f",(pow(M_PI,2)/4*(ri+ro)*pow((ro-ri),2))*c);
}