#include <iostream>
#include <queue>
#include <map>
#include <bitset>
#include <string>
#include <set>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <cstring>
#include <iomanip>
#include <ctime>
#include <stack>
#include <cstdlib>
#include <numeric>
#include <cassert>
#include <complex>
#include <iterator>
//#include <unordered_map>
using namespace std;
#define maxn 100007
#define maxm 400007
#define maxq 1000007
#define maxl 1234
#define modn 1000000007
#define scan(a) scanf("%d",&a)
#define scanl(a) scanf("%lld",&a)
#define scanl2(a,b) scanf("%lld%lld",&a,&b)
#define scans(a) scanf("%s",a)
#define scans2(a,b) scanf("%s%s",a,b)
#define scand(a) scanf("%lf",&a)
#define scan2(a,b) scanf("%d%d",&a,&b)
#define scand2(a,b) scanf("%lf%lf",&a,&b)
#define scan3(a,b,c) scanf("%d%d%d",&a,&b,&c)
#define scan4(a,b,c,d) scanf("%d%d%d%d",&a,&b,&c,&d)
#define scan5(a,b,c,d,e) scanf("%d%d%d%d%d",&a,&b,&c,&d,&e)
#define print(a) printf("%d\n",a);
#define printl(a) printf("%lld\n",a);
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define rrep(i,a,b) for(int i=a;i>= b;i--)
#define fscan(a) fscanf(stream,"%d", &a);
#define mp      make_pair	
#define pb      push_back
#define eb      emplace_back
#define mm(a,b) memset(a,b,sizeof a)
#define log2(n) (double)(log(n) / log(2.0))
#define _crt_disable_perfcrit_locks
#define bll __int128
#pragma warning(disable:4996)
typedef long long ll;
typedef unsigned long long ull;
const int inf = 0x3f3f3f3f;
typedef vector <int> vi;
typedef vector <ll> vll;
typedef map <ll, ll> mll;
typedef pair <ll, ll> pll;
typedef map <int, int> mii;
typedef pair <int, int> pii;
typedef map <char, int> mci;
typedef map <char, char> mcc;
typedef pair <char, int> pci;
typedef complex<double> cd;
typedef vector<complex<double> > vcd;
const double eps = 1e-8;
const double PI = 2 * acos(0.0);

int cc, bb; char ch; inline int F() {
	while (ch = getchar(), (ch < 48 || ch> 57) && ch != '-'); ch == '-' ? cc = bb = 0 : (cc = ch - '0', bb = 1);
	while (ch = getchar(), ch > 47 && ch < 58)cc = (cc << 1) + (cc << 3) + (ch ^ 48); return bb ? cc : -cc;
}
void write(int x) {
	int y = 10, len = 1;
	while (y <= x) { y *= 10; len++; }
	while (len--) { y /= 10; putchar(x / y + 48); x %= y; }
}

vector<ll> res;
int turn;
void dfs(int r, ll now, int last) {
	if (r == turn) {
		res.push_back(now);
		return;
	}
	int p = last - 1;
	int q = last + 1;
	now *= 10;
	if (p >= 0)
		dfs(r + 1, now + p, p);
	dfs(r + 1, now + last, last);
	if (q <= 9)
		dfs(r + 1, now + q, q);
}
int main() {
	//ios::sync_with_stdio(0);
	//cin.tie(0);
	//FILE* stream = fopen("L:/20.in", "rb+")
	/*int x, y, z;
	cin >> x >> y >> z;
	swap(x, y);
	swap(x, z);
	cout << x << " " << y << " " << z << endl;*/
	/*int n, m;
	int a[107];
	cin >> n >> m;
	int sum = 0;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		sum += a[i];
	}
	int need = ceil(sum * 1.0 / (4 * m));
	int total = 0;
	for (int i = 0; i < n; i++) {
		if (a[i] >= need)total++;
	}
	if (total >= m)
		cout << "Yes" << endl;
	else
		cout << "No" << endl;*/
		/*ll n, k;
		cin >> n >> k;
		n %= k;
		ll res = min(n, k - n);
		cout << res << endl;*/
	for (int i = 1; i <= 10; i++) {
		turn = i;
		for (int j = 1; j <= 9; j++)
			dfs(1, j, j);
	}
	int k;
	cin >> k;
	cout << res[k - 1] << endl;
	return 0;
}

Measured memory_bytes: 2420