03.Mobile operator

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


int main()
{
    string duration_contract, type_contract, added_internet;
    double months_of_pay;
    cin >> duration_contract >> type_contract >> added_internet >> months_of_pay;

    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_internet == "yes")
    {
        if (sum <= 10) {
            sum = sum + 5.5;
        }
        else if (sum <= 30) {
            sum = sum + 4.35;
        }
        else if (sum > 30) {
            sum = sum + 3.85;
        }
    }
        if (duration_contract == "two") {
            sum = sum - (sum*0.0375);
        }

    cout << fixed << setprecision(2) << sum * months_of_pay << " lv." << endl;
    return 0;
}