#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i;
	cin>>n;
	if(n%2==1) for(i=1;i<=n;i+=2)
	cout<<i;
	if(n%2==0) 
	for(i=1;i<=n;i++)
	cout<<i;
	
	
	
	
	return 0;
}
/**************************************************************
	Problem: 1060
	User: 21A
	Language: C++
	Result: Wrong Answer
****************************************************************/