#include <iostream>
#include <string>

using namespace std;

int main() {


    string currin, currout;
    double unit;
    float pv ,pn;
    int r;

    // Курс валют на 17.12.17

    const double CURGR = 0.47;
    const double CURGD = 27.50;
    const double CURRD = 58.89;
    const double CURRE = 69.42;
    const double CURGE = 32.30;
    const double CURDE = 1.1805148137283;

    cout << "Zick hain!" << "\n\n";
    cout << "ENTER VALUE TO CONVERT [ grn | dol | rub ] !" << endl;
    cin >> currin;
    cout << "ENTER VALUE WHICH U WILL CONVERT [ grn | dol | rub | eur ] !" << endl;
    cin >> currout;
    cout << "ENTER NUMBERS " << endl;
    cin	>> unit;
    cout<<"ENTER PROMIZOK NYZHNYI";
    cin>>pn;
    cout<<"ENTER RYZNICA";
    cin>>r;
    cout << "\nI do the calculations...\n\n";

    {
       for (int i=pn; i<=pv;  i=+r||)
     {
    cin.get(); //Ждем нажатия клавиши Enter
    }


    if ((currin == "grn") && (currout == "rub")) {
        double result, a;
        a = CURGR;
        result = unit / a;

    } else if ((currin == "rub") && (currout == "grn")) {
        double result, a;
        a = CURGR;
    }
    else {



        if ((currin == "dol") && (currout == "grn")) {
            double result, a;
            a = CURGD;
            result = unit * a;
            cout << unit << "USD IN GRN: "
                << result << endl;
        }
        else if ((currin == "grn") && (currout == "dol")) {
            double result, a;
            a = CURGD;
            result = unit / a;
            cout << unit << " GRN IN USD: "
                << result << endl;
        }
        else {



            if ((currin == "rub") && (currout == "dol")) {
                double result, a;
                a = CURRD;
                result = unit / a;
                cout << unit << " RUB IN USD: "
                    << result << endl;
            } else if ((currin == "dol") && (currout == "rub")) {
                double result, a;
                a = CURRD;
                result = unit * a;
                cout << unit << "USD IN RUB: "
                    << result << endl;
            }
            else {
                if ((currin == "eur") && (currout == "grn")) {
                    double result, a;
                    a = CURGE;
                    result = unit * a;
                    cout << unit << " EUR IN GRN: "
                        << result << endl;
                }
                else if ((currin == "grn") && (currout == "eur")) {
                    double result, a;
                    a = CURGE;
                    result = unit / a;
                    cout << unit << " GRN IN EUR: "
                        << result << endl;
                }
                else {
                    if ((currin == "eur") && (currout == "rub")) {
                        double result, a;
                        a = CURRE;
                        result = unit * a;
                        cout << unit << " EUR IN RUB: "
                            << result << endl;
                    }
                    else if ((currin == "rub") && (currout == "eur")) {
                        double result, a;
                        a = CURRE;
                        result = unit / a;
                        cout << unit << " RUB IN EUR: "
                            << result << endl;
                    }
                    else {
                        if ((currin == "eur") && (currout == "dol")) {
                            double result, a;
                            a = CURDE;
                            result = unit * a;

                        }
                        else if ((currin == "dol") && (currout == "eur")) {
                            double result, a;
                            a = CURDE;
                        }
                        else {
                            cout << "ERROR NO CORRECT INPUT !" << endl;
                        }
                    }
                }
            }
        }

    }

}