#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector< int > vi;
typedef vector< vi > vvi;
typedef vector< ll > vl;
typedef vector< vl > vvl;
typedef pair< int, int > pii;
typedef vector< pii > vp;
typedef vector< double > vd;
typedef vector< vd > vvd;
typedef vector< string > vs;

template< class T1, class T2 >
int upmin( T1 &x, T2 v ){
  if( x > v ){
    x = v;
    return 1;
  }
  return 0;
}

template< class T1, class T2 >
int upmax( T1 &x, T2 v ){
  if( x < v ){
    x = v;
    return 1;
  }
  return 0;
}

const int INF = 0x3f3f3f3f;

int N;

void init(){
  cin >> N;
}

void preprocess(){
  int cnt = 0;
  for( int len = 1; ; ++len ){
    for( int s = 1; s < 1 << len; s += 2 ){
      int cnt5 = __builtin_popcount( s );
      if( cnt5 % 3 != 0 ) continue;
      if( ++cnt == N ){
        for( int i = len - 1; i >= 0; --i )
          cout << "35"[ s >> i & 1 ];
        cout << endl;
        exit( 0 );
      }
    }
  }
}

void solve(){

}

signed main(){
  ios::sync_with_stdio( 0 );
  init();
  preprocess();
  solve();
  return 0;
}