#include<iostream>
using namespace std;
class customer
{
    public:
    string name;
    public:
    void getname()
    {
        cin>>name;
    }
};
class meter 
{
    public:
    int usage;
    public:
    void getusage()
    {
        cin>>usage;
    }
};
class bill:public customer,public meter
{
    public:
    int totalbill;
    public:
    void getbill()
    {
        totalbill = usage*5 + 50;
    }
}

   {
    bill obj1;
    obj1.getname();
    obj1.usage();
    obj1.getbill();
    if(obj1.usage<0)
    
        cout<<"invalid input";
        return 0;
    }
    cout<<obj1.name<<" "<<obj1.totalbill;
    return 0
}