/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author zjsdut
 */

#include <iostream>
#include <iomanip>
#include <vector>
struct fast_ios {
  fast_ios() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed << std::setprecision(10);
  };
} fast_ios_;

template <typename A, typename B> bool chkmin(A &a, const B &b) {
  if (b < a) {
    a = b;
    return true;
  }
  return false;
}

template <typename A, typename B> bool chkmax(A &a, const B &b) {
  if (b > a) {
    a = b;
    return true;
  }
  return false;
}

template <typename T> std::istream &operator>>(std::istream &stream, std::vector<T> &vec) {
  for (auto &x : vec)
    stream >> x;
  return stream;
}

void scan() {}

template <class T, class... Args> void scan(T &a, Args &... rest) {
  std::cin >> a;
  scan(rest...);
}

using ll = long long;
using vl = std::vector<ll>;
using vb = std::vector<bool>;
using vi = std::vector<int>;
using pii = std::pair<int, int>;
template <typename T> using vv = std::vector<std::vector<T>>;
#define rng(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define up(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define down(i, b, a) for (int i = int(b); i >= int(a); i--)
#define TOKENPASTE(x, y) x##y
#define TOKENPASTE2(x, y) TOKENPASTE(x, y)
#define rep(n)                                                                 \
  for (int TOKENPASTE2(_iter_, __LINE__) = 0,                                  \
                               TOKENPASTE2(_num_, __LINE__) = (int)(n);        \
       TOKENPASTE2(_iter_, __LINE__) < TOKENPASTE2(_num_, __LINE__);           \
       ++TOKENPASTE2(_iter_, __LINE__))
#define FOR(x, cont) for (const auto &x : cont)
#define For(x, cont) for (auto &x : cont)
#define all(x) begin(x), end(x)
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ep emplace
#define SZ(x) (int)(x).size()
#define UNIQ(vec) (vec).erase(unique(all(vec)), end(vec))
#define LB(cont, x) int(lower_bound(all(cont), x) - begin(cont))
#define UB(cont, x) int(upper_bound(all(cont), x) - begin(cont))

template <typename T>
std::ostream &operator<<(std::ostream &stream, const std::vector<T> &vec) {
  if (!vec.empty()) {
    stream << vec[0];
    for (size_t i = 1; i != vec.size(); ++i)
      stream << ' ' << vec[i];
  }
  return stream;
}

template <typename T> void print(const std::vector<T> &t) { std::cout << t << '\n'; }

template <typename T> void print(const std::vector<std::vector<T>> &t) {
  for (const auto &row : t) {
    print(row);
  }
}

template <typename T> void print(const T &t) { std::cout << t << ' '; }

template <typename T, typename... Args>
void print(const T &t, const Args &... rest) {
  print(t);
  print(rest...);
}

template <typename T> void println(const T &t) { std::cout << t << '\n'; }

template <typename T, typename... Args>
void println(const T &t, const Args &... rest) {
  print(t);
  println(rest...);
}
#include <bits/stdc++.h>

using namespace std;
// debug code by tourist
std::string to_string(const std::string &s) { return '"' + s + '"'; }

std::string to_string(const char *s) { return to_string((std::string)s); }

std::string to_string(bool b) { return (b ? "true" : "false"); }

template <typename A, typename B> std::string to_string(const std::pair<A, B>& p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A> std::string to_string(const A& v) {
  bool first = true;
  std::string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

void debug_out() { std::cerr << std::endl; }

template <typename Head, typename... Tail> void debug_out(const Head& H, const Tail&... T) {
  std::cerr << " " << to_string(H);
  debug_out(T...);
}

#if defined LOCAL
#define debug(...) std::cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

using namespace std;

class DLunlunNumber {
  static void SOLVE() {
    int k;
    scan(k);
    vv<ll> dp(11, vl(10));
    fill(all(dp[1]), 1);
    rng(i, 2, 11) {
      rng(j, 0, 10) { dp[i][j] += dp[i - 1][j]; }
      rng(j, 1, 10) { dp[i][j] += dp[i - 1][j - 1]; }
      rng(j, 0, 9) { dp[i][j] += dp[i - 1][j + 1]; }
    }
    int tot = 0, len, first, rank;
    bool flag = false;
    for (len = 1; len <= 10; ++len) {
      for (first = 1; first <= 9; ++first) {
        if (tot + dp[len][first] >= k) {
          flag = true;
          rank = k - tot;
          break;
        }
        tot += dp[len][first];
      }
      if (flag)
        break;
    }
    debug(len, first, rank);
    cout << first;
    down(i, len - 1, 1) {
      rng (j, 0, 10) {
        if (abs(j - first) <= 1) {
          if (rank > dp[i][j]) {
            rank -= dp[i][j];
          } else {
            first = j;
            cout << j;
            break;
          }
        }
      }
    }
    cout << '\n';
  }

public:
  static void solve(std::istream &in, std::ostream &out) {
    auto cin_buff = std::cin.rdbuf(in.rdbuf());
    auto cerr_buff = std::cerr.rdbuf(cout.rdbuf(out.rdbuf()));
    SOLVE();
    std::cout.rdbuf(cerr.rdbuf(cerr_buff));
    std::cin.rdbuf(cin_buff);
  }
};


int main() {
  DLunlunNumber solver;
  std::istream& in(std::cin);
  std::ostream& out(std::cout);
  solver.solve(in, out);
  return 0;
}


Measured memory_bytes: 256