콜라 문제

package programmers;

public class 콜라문제 {

   public static int solution(int a, int b, int n) {
      int cola = 0;
      while (n >= a) {
         cola += (n / a) * b;
         n = (n / a) * b + (n % a);
      }

      return cola;
   }

   public static void main(String[] args) {
      System.out.println(solution(2, 1, 20));
      System.out.println(solution(3, 1, 20));
      System.out.println(solution(3,2,20));
   }
   
}