#include<bits/stdc++.h> using namespace std; int main(){ double q,n,l,hq; cin>>q>>n; if(n1)l=0.0325; if(n2)l=0.0375; if(n3||n4)l=0.0425; if(n>=5)l=0.0475; hq=q+q*(n*l); cout<<fixed<<setprecision(1)<<hq; return 0; }