#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;
ul over = 1000000007;

int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed;
  ll n;
  cin >> n;
  cout << (n%2==1 ? 7 : 1);
  n /= 2;
  n--;
  for (ll i = 0; i < n; ++i) cout << 1;
  cout << endl;
  return 0;
}