#include <bits/stdc++.h>

using namespace std;

int main(int argc, char const *argv[])
{
	int n;
	cin >> n;

	if(n == 10){
		for(int i = 1; i < n; i++){
		cout << i;
	}
	cout << 0;
		cout << "\n";
	}
	else{
		for(int i = 1; i <= n; i++){
		cout << i;
	}

		cout << "\n";
	}
	
	return 0;
}