#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
//---------------------------
using namespace std;
//---------------------------
#define REP(i,n) for(int i = 0; i < (n); i++)
#define P(x) cout << (x) << "\n"
//---------------------------


int main(){
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);



  int n;cin>>n;
  string s;
  if (n%2 == 0) {
    REP(i,n/2){s[i]= '1';}
  }else{
    s[0] = '7';
    for (int i = 1; i < (n-1)/2 - 1; i++) {
      s[i] = '1';
    }
  }
  long long a = stoll(s);
  P(a);

  return 0;
}