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17 lines
379 B
C#
17 lines
379 B
C#
using System;
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namespace _466A
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{
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class Program
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{
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static void Main(string[] args)
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{
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int[] a = Array.ConvertAll(Console.ReadLine().Split(), int.Parse);
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int b = a[0] * a[2];
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int c = (a[0] % a[1] == 0) ? a[0] / a[1] * a[3] : (a[0] / a[1] + 1) * a[3];
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int d = a[0] / a[1] * a[3] + (a[0] % a[1]) * a[2];
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Console.WriteLine(Math.Min(b, Math.Min(c, d)));
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}
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}
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}
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