#include <bits/stdc++.h> using namespace std; #ifdef _RUTHEN #include <debug.hpp> #else #define show(...) true #endif using ll = long long; #define rep(i, n) for (int i = 0; i < (n); i++) template <class T> using V = vector<T>; int main() { ios::sync_with_stdio(false); cin.tie(0); long long N; cin >> N; N--; V<pair<int, int>> A; for (int a = 1; a <= 9; a++) { for (int b = a + 1; b <= 9; b++) { A.push_back({a, b}); } } long long d = N / A.size(); auto [a, b] = A[N % 36]; cout << a; rep(i, d) cout << b; cout << b << '\n'; return 0; }