/* -*- coding: utf-8 -*-
 *
 * 2246.cc:  No.2246 1333-like Number - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

int as[36], bs[36];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n); n--;

  int q = n / 36, r = n % 36;

  for (int k = 0, a = 1; a < 9; a++)
    for (int b = a + 1; b <= 9; b++, k++)
      as[k] = a, bs[k] = b;

  printf("%d%d", as[r], bs[r]);
  for (int i = 0; i < q; i++) printf("%d", bs[r]);
  putchar('\n');
  
  return 0;
}