#include<iostream>
using namespace std;
class customer
{
    public:
        string name;
};
class meter
{
    public:
        int units;
};
 class bill: public customer, public meter:
{
    public:
        int calculatebill;
        {
            return(units*5)+50;
        }    
};
int main()
{
    bill b;
    cin>>b.name;
    cin>>b.units;
    if(b.units<0)
    {
      cout<<"Invaid input";
    }
    else
    {
        cout<<b.name<<""<<b.calculatebill();
    }
    return 0;
}