#include <bits/stdc++.h> using namespace std; int main(){ int a; double b=0,c; cin>>a; if(a<=150){ b=a*1.0*0.4463; printf("%.1lf",b); } if(a>150&&a<=400){ b=150*0.4463; a=a-150; b=b+a*1.0*0.4663; printf("%.1lf",b); } if(a>400){ b=150*0.4463; b=b+250*0.4663; a=a-400; b=b+a*1.0*0.5663; printf("%.1lf",b); } return 0; }