using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("ТЕСТ: 35, 10, 9, 20, 17");

        Console.WriteLine($"ВІДПОВІДЬ: {calcMinPrice(35, 10, 9, 20, 17)}");

        Console.WriteLine("");

        Console.WriteLine("ТЕСТ: 55, 30, 20, 20, 16");

        Console.WriteLine($"ВІДПОВІДЬ: {calcMinPrice(55, 30, 20, 20, 16)}");

    }

​

    private static int calcMinPrice(int n, int a, int b, int c, int d) {

        int minPrice = n;

        int pricePlan1Summ = calcPricePlanSumm(n, a, b);

        if (pricePlan1Summ < minPrice)

            minPrice = pricePlan1Summ;

        int pricePlan2Summ = calcPricePlanSumm(n, c, d);

        if (pricePlan2Summ < minPrice)

            minPrice = pricePlan2Summ;

        return minPrice;

    }

    private static int calcPricePlanSumm(int n, int a, int b) {

        int pricePlan1Count = n / a + (n % a == 0 ? 0 : 1);

        return pricePlan1Count * b;

    }

}