Hotel.cpp

#include<bits/stdc++.h>
using namespace std;
int main() {
    int d,a,n; cin >> d >> a >> n;

    int valor;
    if(n < 16) {
        valor = d + (n-1)*a;
    }
    else {
        valor = d + 14*a;
    }

    int dias = (31-n+1);

    cout << valor*dias << endl;

}