#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <algorithm>
#include <functional>
#include <limits>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <complex>

using namespace std;

#define INF (INT_MAX/3)
#define PI (2*acos(0.0))
#define EPS (1e-8)

typedef long long ll;
typedef unsigned long long ull;

int main(){
  ios_base::sync_with_stdio(0);
  int N, t, o, ans;
  cin >> N;
  t = N / 2;  o = N % 2;
  
  if(o == 0) ans = 1;
  else ans = 7;
  t--;

  for(int i = 0; i < t; i++){
    ans = 10 * ans + 1;
  }
  cout << ans << endl;
  return 0;
}