03.Mobile operator

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

int main()
{
    string duration_contract;
    string type_contract;
    string added_network;
    int months_of_payment;
    cin >> duration_contract >> type_contract >> added_network >> months_of_payment;

    double sum = 0;
    if (duration_contract == "one")
    {
        if (type_contract == "Small")
        {
            sum = 9.98;
        }
        else if (type_contract == "Middle")
        {
            sum = 18.99;
        }
        else if (type_contract == "Large")
        {
            sum = 25.98;
        }
        else if (type_contract == "ExtraLarge")
        {
            sum = 35.99;
        }
    }
    else if (duration_contract == "two")
    {
        if (type_contract == "Small")
        {
            sum = 8.58;
        }
        else if (type_contract == "Middle")
        {
            sum = 17.09;
        }
        else if (type_contract == "Large")
        {
            sum = 23.59;
        }
        else if (type_contract == "ExtraLarge")
        {
            sum = 31.79;
        }
    }
    if (added_network == "yes")
    {
        if (sum <= 10) {
            sum = sum + 5.50;
        }
        else if (sum <= 30) {
            sum = sum + 4.35;
        }
        else {
            sum = sum + 3.85;
        }
    }
    if (duration_contract == "two") {
        sum = sum - (sum * 0.0375);
    }

    double total = sum * months_of_payment;
    cout << fixed << setprecision(2) << total << " lv."<< endl;
}