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

class customer{
    public :
    void cName(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 t= unit*5 + 50;
        cout<<t<<endl;
    }
};
int main(){
    string name ;
    int units;
    cin>>name>>units;
    if(units<0){
        cout<<"Invalid input";
        return 0;
    }
     bill obj;
     obj.cName(name);
     obj.total(units);
     return 0;
}