#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>


typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;







int main()
{

    int Q;
    Q = 1;
    //cin >> Q;

    while (Q--) {
        int n;
        cin >> n;
        int x = (n-1) / 36+1;
        int y = (n-1) % 36;
        int c = 0;
        for (int i = 1; i <= 9; i++) {
            for (int j = i + 1; j <= 9; j++) {
                
                if (c == y) {
                    cout << i;
                    for (int k = 0; k < x; k++)cout << j;
                    return 0;
                }c++;
            }
        }
    }
    return 0;
}