#include <iostream>
#include <string>

int main()
{
    double eur_rur = 79.06;
    double usd_rur = 71.86;
    double gbp_rur = 102.30;
    double currency = 0;
    char unit = ' ';

    std::cout << "Please enter the number of roubles you have: " << std::endl;
    std::cin >> currency;
    std::cout << "Please enter the currency you want to convert you money ('e' - Euro, 'd' - Dollar, 'g' - Great Britan Pounds): " << std::endl;
    std::cin >> unit;

    if (unit == 'e')
    {
        std::cout << currency << " roubles = " << currency / eur_rur << " Euro." << std::endl;
    }
    else if (unit == 'd')
    {
        std::cout << currency << " roubles = " << currency / usd_rur << " Dollars." << std::endl;
    }
    else if (unit == 'g')
    {
        std::cout << currency << " roubles = " << currency / gbp_rur << " Great Britan Pounds." << std::endl;
    }
    else
    {
        std::cout << "Sorry, i do not understand what you input." << std::endl;
    }
}