#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;
using P = pair<int, int>;
constexpr ld EPS = 1e-12;
constexpr int INF = numeric_limits<int>::max() / 2;
constexpr int MOD = 1e9 + 7;

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

    int n;
    cin >> n;
    string res = "";
    if (n % 2)
    {
        for (int i = 0; i < (n - 3) / 2; i++)
            res += '1';
        res += '7';
    }
    else
    {
        for (int i = 0; i < n / 2; i++)
            res += '1';
    }
    cout << res << endl;
}