#include <iostream>
#include <map>

using namespace std;

int main()
{
    int a[36] = {1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 8};
    int h, l, k, r, j, c;
    long n, i, w;
    cin >> n;
    w = n / 36 + 1;
    r = n % 36;
    if (r == 0)
    {
        l = 9;
        h = 8;
        w--;
    }
    else
    {
        h = a[r-1];
        for (j = 1; j < h; j++)
        {
            r -= (9 - j);
        }
        l = r + h;
    }
    cout << h;
    for (i = 0; i < w; i++)
    {
        cout << l;
    }
    cout << endl;
}