#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>a;
	b=a/1000;
	c=a-b*1000;
	if(b>c){
		d=a;
	}else{
		d=c*1000+b;
	} 
	cout<<d;
}
/**************************************************************
	Problem: 1631
	User: toughuatao1
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/