#include<iostream>
#include<string>
using namespace std;

class customer {
    public:
    void customerName (string name) { cout << name << " ";}
};

class Meter  {
    public:
    int units (int unit) {return unit;}
};

class Bill :: public Customer, public Meter {
    public:
    void total (int u) {
        int unit = units(u);
        int total = unit * 5 + 50;
        cout << total << endl;
    }
};

int main() {
    string name:
    int units;
    cin >> name >> units;
    if (units < 0) {cout << "Invalid input"; return 0; }
    Bill obj;
    obj.customerName(name);
    obj.total(units);
    return 0;
}