#include <iostream>
#include <cstring>
using namespace std;

int main() {
	int N;
	cin >> N;

	string ans = "";

	while (N >= 1) {
		if (N == 3) {
			ans.append("7");
			N -= 3;
		} else {
			ans.append("1");
			N -= 2;
		}
	}

	cout << ans << endl;
}