#include<iostream> using namespace std; int main(){ double x; cin>>x; if(x<10000){ cout<<0; }else if(x>=10000 && x<=29999){ cout<<int(1.0*x/100*3); }else if(x>=30000 && x<=49999){ cout<<int(1.0*x/100*7); }else{ cout<<int((x-1000)/100*13); } return 0; }