#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define Z class
#define ll long long
#define ln cout<<'\n'
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.10f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
template<Z A>void pr(A a){cout<<a;ln;}
template<Z A,Z B>void pr(A a,B b){cout<<a<<' ';pr(b);}
template<Z A,Z B,Z C>void pr(A a,B b,C c){cout<<a<<' ';pr(b,c);}
template<Z A,Z B,Z C,Z D>void pr(A a,B b,C c,D d){cout<<a<<' ';pr(b,c,d);}
template<Z A>void PR(A a,ll n){rep(i,n){if(i)cout<<' ';cout<<a[i];}ln;}
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
typedef pair<int,int> P;

vector<vector<ll> > Comb(int n){
  vector<vector<ll> > v(n+1,vector<ll>(n+1));
  for(int i=0;i<=n;i++) v[i][i] = v[i][0] = 1LL;
  for(int i=2;i<=n;i++) {
    for(int j=1;j<i;j++) v[i][j] = v[i-1][j] + v[i-1][j-1];
  }
  return v;
}

void Main() {
  vector<vector<ll> > v=Comb(66);
  ll n;
  while(R n&&n) {
    string ans="";
    ll x=0,t=2,xx,yy,zz;
    while(1) {
      REP(i,1,10) {
        ll x2=x;
        rep(j,t-1) {
          ll y=x+v[t-1][j]*9;
          if(y>=n) {
            zz=x2;
            xx=t;
            yy=i;
            ans+=(char)(i+'0');
            goto end;
          }
          x=y;
        }
      }
      t++;
    }
  end:;
    set<int> s;
    s.in(yy);
    rrep(l,xx) {
      if(!l) break;
      x=zz;
      if(s.size()<2) {
        rep(i,10) {
          if(l==1&&i==*s.begin()) continue;
          ll x2=x;
          rep(j,l) {
            ll y=x;
            if(i==*s.begin()) {
              if(j<l-1) y+=v[l-1][j]*9;
              else continue;
            } else y+=v[l-1][j];
            if(y>=n) {
              zz=x2;
              s.in(i);
              ans+=(char)(i+'0');
              goto next;
            }
            x=y;
          }
        }
      } else {
        tr(it,s) {
          ll x2=x;
          rep(j,l) {
            ll y=x+v[l-1][j];
            if(y>=n) {
              zz=x2;
              ans+=(char)(*it+'0');
              goto next;
            }
            x=y;
          }
        }
      }
    next:;
    }
    pr(ans);
  }
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}

