#include <iostream>
#include <string>

using namespace std;

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