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