#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;


int main()
{
    ll n;
    cin >> n;
    vector<ll> v = {12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26,\
                     27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47,\
                      48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89};
    ll quo = n/36;
    string s = to_string(v[(n-1)%36]);
    char t = s.back();
    while (quo){
        s += t;
        quo--;
    }
    cout << s << endl;
}