#include <iostream>

using namespace std;

enum Process
{
    Plus = 0,
    Minus = 1,
    Multiply = 2,
    Division = 3
};

int main()
{
    int num0, num1;

    int value = 0;

    std::cout << "enter a number: " << endl;
    cin >> num0;

    cout << "process: " ;
    cin >> value;

    cout << "enter a number: " << endl;
    cin >> num1;

    switch (value)
    {
    case  Plus:
        cout << num0 + num1 << endl;
        break;
    case Minus:
        cout << num0 - num1 << endl;
        break;
    case Multiply:
        cout << num0 * num1 << endl;
        break;
    case Division:
        cout << num0 / num1 << endl;
        break;

    default:
    cout<<"No valid process"<<endl;
        break;
    }
    return 0;
}