#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int main() {
  int n;
  cin >> n;
  if(n%2==1) {
      cout << 7;
      n-=3;
      for(int i=n/2; i>0; i--) {
          cout << 1;
      }
      cout << endl;
  }
  else {
      for(int i=n/2; i>0; i--) {
          cout << 1;
      }
      cout << endl;
  }
}