#include<bits/stdc++.h>
using namespace std;
int s,n;
int main(){
    int s,n;
    cin>>s;
    n=s*1000+s;
    n=n/1001;
    cout<<n;
}
/**************************************************************
	Problem: 1961
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/