#include <iostream>
using namespace std;
int main() {
    int num;
    cin >> num;
     
    int first_part = num / 1000;  
    int second_part = num % 1000;  
     
    if (first_part >= second_part) {
        cout << num;   
    } else {
        cout << second_part * 1000 + first_part;  
    } 
     
    return 0;
}
/**************************************************************
	Problem: 1631
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/