#include <bits/stdc++.h>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)

int d[10] = {6, 2, 5, 5, 4, 5, 6, 3, 7, 6};

int main() {
  
  int N; cin >> N;
  if(N == 2) {
    cout << 1 << endl;
  }
  else if(N == 3) {
    cout << 7 << endl;
  }
  else {
    string S;
    {
      string s;
      int k = N / 3;
      rep(i, k) { s+="7"; }
      N -= k*3;
      if(N == 1) {
        s.back() = '1';
        s += "1";
      }
      else {
        int l = N / 2;
        rep(i, l) {
          s+="1";
        }
      }
      S = s;
    }
    {
      string s;
      int k = N / 2;
      rep(i, k) { s+="1"; }
      N -= k*2;
      if(N == 1) {
        s.back() = '7';
      }
      S = max(S, s);
    }
    cout << S << endl;
  }
  
  return 0;
}