#include <bits/stdc++.h> using namespace std; int main(){ int n; cin >> n; double m=0; if(n>=401){ m += (n-400)*0.5663 + (400-150)*0.4663 + 150*0.4463; }else if(n>=151){ m += (n-150)*0.4663 + 150*0.4463; }else{ m += n*0.4463; } m = int((m*10)+0.5)/10.0; cout << m; return 0; }