#include <iostream>
#include <string>
using namespace std;

class Calculator {
public:
    double add(double a,double b){
        return a + b;
    }
    double sub(double a,double b){
        return a - b;
    }
};

class AdvancedCalculator : public Calculator{
    public:
        double mul(double a,double b){
            return a * b;
        }
        double div(double a,double b){
            return a / b;
        }
};

int main() {
    double n1,n2;
    cin >> n1;
    cin >> n2;

    AdvancedCalculator acr;

    cout << acr.add(n1,n2) <<endl;
    cout << acr.sub(n1,n2) <<endl;
    cout << acr.mul(n1,n2) <<endl;
    cout << acr.div(n1,n2) <<endl;
    
}