#include <bits/stdc++.h>
using namespace std;
using ch = char;
using ll = long long;
using ld = long double;
using db = double;
using st = string;
using vdb = vector<db>;
using vvdb = vector<vdb>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vd = vector<ld>;
using vvd = vector<vd>;
using vs = vector<st>;
using vvs = vector<vs>;
using vc = vector<ch>;
using vvc = vector<vc>;
using vb = vector<bool>;
using vvb = vector<vb>;
const ll mod1 = 998244353;
const ll mod2 = 1000000007;

int main(){
  ll N;
  cin>>N;
  ll a;
  if(N%2==0){
    a=N/2;
    for(int i=0; i<a; i++)
      cout<<1;
    cout<<endl;
    return 0;
  }
  a=N/2-1;
  cout<<7;
  for(int i=0; i<a; i++)
    cout<<1;
  cout<<endl;
}