#include <iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    int ans = 89;
    if(n<100) cout<<"00"<<endl;
    else if(n<=1000){
        cout<<"0";
        cout<<n/100<<endl;
    }
    else if(n<=5000) cout<<n/100<<endl;
    else if(n<=30000) cout<<n/1000+50<<endl;
    else if(n<=70000) cout<<(n/1000-30)/5+80<<endl;
    else cout<<ans<<endl;
    return 0;
}