#include <iostream>
#include <string>
using namespace std;

int main() {
  int i, sho, amari;
  string s;
  cin >> i;
  amari = i % 2;
  sho = (i - amari) / 2;
  s = "";
  if (amari == 1) {
    sho--;
  }
  for (int j = 0; j < sho; j++) {
    s = s + "1";
  }
  if (amari == 1) {
    s = s + "7";
  }
  return 0;
}