#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n;
    cin >> n;
    string s;
    if (n % 2)
    {
        s = "7";
        for (int i = 1; i <= -1 + (n - 1) / 2; i++)
        {
            s.push_back('1');
        }
    }
    else
    {
        for (int i = 1; i <= n / 2; i++)
        {
            s.push_back('1');
        }
    }
    cout << s;
    
    //system("pause");
}