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

int main(){
  int n;
  cin >> n;
  
  string result;
  int i;
  
  for(i=0;i<n/2;i++) result += '1';
  if(n%2 == 1)result[0] = '7';

  cout << result << endl;
  
  return 0;
}