#include<bits/stdc++.h>
using namespace std;
constexpr int Inf = 1000000010;
constexpr long long INF= 2000000000000000000;

template<typename T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<typename T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }

template<typename T,typename U>
T modpow(T N, U P, T M = -1) {
    if(P < 0) return 0;
    T ret = 1;
    if(M != -1) ret %= M;
    while(P) {
        if(P & 1) {
            if(M == -1) ret *= N;
            else ret = ret * N % M;
        }
        P /= 2;
        if(M == -1) N *= N;
        else N = N * N % M;
    }
    return ret;
}

constexpr long long MOD = 998244353;

int main() {
    int n;
    cin >> n;
    n--;
    int cnt1 = n / 36;
    int cnt2 = n % 36;
    vector<int> cnt = {12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89};
    cout << cnt[cnt2] / 10;
    for(int i = 0;i < cnt1 + 1;i++) {
        cout << cnt[cnt2] % 10;
    }
    cout << endl;
}