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