#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;


int main() {


    int N;
    cin >> N;
    string s;

    if (N % 2 == 0) {
        for (int i = 0; i < N / 2; ++i) {
            s += "1";
        }
    } else {
        for (int i = 0; i < (N / 2) - 1; ++i) {
            s += "1";
        }
        s.insert(0,"7");
    }

    cout << s << endl;

}