#include<bits/stdc++.h> using namespace std; int main() { int n,s; cin >> n ; if(10>=n) { s=8n; float s=40.00; cout<<fixed<<setprecision(2)<<s<<endl; } else if(n>10) s=(87.5)*n;

cout<<fixed<<setprecision(2)<<s<<endl;
return 0;

}