#include <iostream>
using namespace std;
int main()
{
float f,m=1000;
cin>>f;
if(f>1000 && f<=2000)
m+=f*0.1;
else if(f<=4000)
m+=f*0.12;
else if(f<=6000)
m+=f*0.15;
else if(f<=8000)
m+=f*0.2;
else
m+=f*0.25;
cout<<m;
return 0;
}