#include<iostream>
using namespace std;
class shop{
    shop(float weight , float price){
        public:
        float w ,p;
        w = weight ;
        p = price ;
    }
    void check(){
        public:
        float t;
        if (0.1<=w && 100>=w && p>=0.5 &&p<=200){
            t=w*p;
            cout<<t;
        }
        else{
            cout<<"Invalid input";
        }
    }
};
int main()
{
    
    
}