#include <iostream>
using namespace std;

int main(){
    cout << "Press 1 for cube"<<endl;
    cout << "Press 2 for cylinder"<<endl;
    cout << "Press 3 for sphere"<<endl;
    cout << "Press 4 for cone"<<endl;

    int option;
    float s,r,cube,cyl,ball,cone,h;
    float pi = 3.14;

    cin >> option;

    switch(option){
        case 1:
            cout << "Input s ";
            cin >> s;
            if(s<1){
                cout << "error";
                return 0;
            }
            cube = 6*s*s;
            cout << cube;
            break;
        case 2:
            cout << "Input r and h ";
            cin >> r;
            cin >> h;
            if(r<1 or h<1){
                cout << "error";
                return 0;
            }
            cyl = (2*pi*r*r)+(2*pi*r*h);
            cout << cyl;
            break;
        case 3:
            cout << "Input r";
            cin >> r;
            if(r<1){
                cout << "error";
                return 0;
            }
            ball = 4*pi*r*r;
            cout << ball;
            break;
        case 4:
            cout << "Input r and s";
            cin >> r;
            cin >> s;
            if(s<1 or r<1){
                cout << "error";
                return 0;
            }
            cone =(pi*r*s)+(pi*r*r);
            cout << cone;
            break;
        default:
            cout << "error";
            break;
    }

    return 0;
}