#include <iostream> #include <cstdio> #include <cmath> using namespace std; int main() { double n , h; cin >> n; if ( n < 150) { h = n * 0.4463; printf("%.1f",h); } else if ( n > 150 && n < 400) { h = (n-150)*0.4663 + (150 * 0.4463); printf("%.1f",h); } else if ( n > 400 ) { h = (n-400)*0.5663 + (150 * 0.4463) + (250 * 0.4663); printf("%.1f",h); } return 0; }