#include <iostream>
#include <string>

using namespace std;

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