#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

void solve1() {
  int N;
  string s;
  cin >> N;
  while (N > 3) {
    N -= 2;
    s += "1";
  }
  if (N == 2) s += "1";
  if (N == 3) s += "7";
  if (s.size() > 1 && s.back() == '7') swap(s.back(), s.front());
  cout << s << endl;
}

void solve2() {
  int N;
  cin >> N;
  string ans;
  if ((N & 1) && (N > 2)) {
    ans = "7";
    N -= 3;
  }
  ans += string(N / 2, '1');
  cout << ans << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  solve2();
  getchar();
}