#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  if (n == 2) {
    cout << 1 << endl;
  } else if (n == 3) {
    cout << 7 << endl;
  } else {
    if (n % 2 == 1) {
      cout << 7;
    }
    for (int i = 0; i < n / 2 - n % 2; i++) {
      cout << 1;
    }
    cout << endl;
  }
}
