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

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