#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;

int main() {
  int N; cin >> N;
  string ans = "";
  while(N > 0){
    if(N == 3){
      ans += "7";
      N -= 3;
    }else{
      ans += "1";
      N -= 2;
    }
  }
  reverse(ans.begin(), ans.end());
  cout << ans << endl;
}