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

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