#include <iostream> #include <cstdio> using namespace std; int main() { int n; double m=0; cin >> n; if(n<=150) { m=n*0.4463; } else if(n>150 && n<=400) { m=150*0.4463+(n-150)*0.4663; } else { m=150*0.4463+(400-151+1)*0.4663+(n-400)*0.5663; } printf("%.1f",m); return 0; }