콜라 문제

#include <string>
#include <vector>

using namespace std;

int solution(int a, int b, int n) 
{
    int answer = 0;
    int m, r;
    
    while(n >= a)
    {
        m = n / a;
        r = m * b;
        n = (n % a) + (r);
        answer += r;
    }
    
    return answer;
}