#include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin>>n;
	if(n / 1000 > n % 1000){
		cout<<n;
	}else{
		cout<<n%1000<<n/1000;
	}
}
 

/**************************************************************
	Problem: 1631
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/