#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cmath>
#include <iostream>
#include <queue>
#include <list>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;


int main(){
  int N;
  cin >> N;

  if(N==2) cout << "1" << endl;
  else if(N==3) cout << "7" << endl;
  else{
    if(N%2==0){
      rep(i,N/2){
        cout << "1";
      }
      cout << endl;
    }else{
      cout << "7";
      rep(i,N/2-1){
        cout << "1";
      }
      cout << endl;
    }
  }

  
  return 0;
}