#include <bits/stdc++.h>

using namespace std;

int main(void) {
  int n;
  cin >> n;

  int seven = n & 1, one = (n - (seven ? 3 : 0)) / 2;
  if (seven) cout << "7";
  for (int i = 0; i < one; i++) {
    cout << "1";
  }
  cout << endl;

  return 0;
}