#include<cstring>
using namespace std; 
int main(){
int n;
double a;
cin>>n;
if(n<=150){
	a=n*0.4463;
}
else if(n>150&&n<=400){
	n-=150;
	a=66.945+n*0.4663;
}
else{
	n=-400;
	a=183.52+n*0.5663;
}
cout<<fixed<<setprecision(1)<<a;
return 0; 
} ```