#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

void display(int i){cout << i;}

int main(){
  int n;
  vector<int> l;
  cin >> n;
  while(2 <= n){
    if(n==3){
      n-=3;
      cout << "7";
    } else {
      n-=2;
      l.push_back(1);
    }
  }
  for_each(l.begin(), l.end(), display);
  cout << endl;
}