#include<bits/stdc++.h> using namespace std; int main(){ int a; float b; cin>>a; if(a<=150){ b=a*0.4463; } else if(a>=151&&a<=400){ b=b+150*0.4463+(a-150)*0.4663; } else{ b=b+150*0.4463+(400-150)*0.4663+(a-400)*0.5663; } cout<<fixed<<setprecision(1)<<b; return 0; }