#include <bits/stdc++.h>

int main() {
    std::cin.tie(nullptr)->sync_with_stdio(false);
    int n; std::cin >> n;
    int m = (n - 1) / 36 + 1, k = (n - 1) % 36;
    for (int a = 1; a <= 9; ++a)
        for (int b = a + 1; b <= 9; ++b) {
            if (k == 0)  {
                std::cout << a;
                for (int i = 0; i < m; ++i)
                    std::cout << b;
                return 0;
            }
            k -= 1;
        }
    return 0;
}