#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,m,h;
    cin>>n;
    m=n%1000;
    h=n/1000;
    if(h>m){
        cout<<n;
    }else{
        cout<<m*1000+h;
    }
}
/**************************************************************
	Problem: 1631
	User: wengsihan
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/