#include<iostream>
#include<iomanip>
int main(){
    double p,d;
    if(!(cin>>p)){
        return 1;
    }
    if (!(cin>>d)){
        return 1;
    }
    double final_price = p*(1.0-(d/100.0));
    cout<<fixed;
    cout<<setprecision(2);
    cout<<final_price<<endl;
}