#include<bits/stdc++.h>
using namespace std;
int main(){
    int s,k;
    cin>>s;
    if(s>=500){
        k=s+200;
    }
    if(s>=200&&s<=299){
        k=s+50;
    }
    if(s>=300&&s<=499){
        k=s+100;
    }
    if(s<200){
        k=s;
    }
    cout<<k;
}
/**************************************************************
	Problem: 1391
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:32 ms
	Memory:2072 kb
****************************************************************/