#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int s,n;
int main()
{
	cin>>s;
	n=s*1000+s;
	n=n/1001;
	cout<<n;
	return 0;
}
/**************************************************************
	Problem: 1961
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/