#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>a;
	b=a/1000;
	c=a/1000%1000;
	if(c>b){
		d=c*1000+b;
	}else{
		h=b*1000+c;
	}
	cout<<h;
}
/**************************************************************
	Problem: 1631
	User: toughuatao1
	Language: C++
	Result: Compile Error
****************************************************************/