#include <iostream>

using namespace std;

int main() {
	int n;
	cin >> n;
	int answer = 0;
	if (n % 2 == 1) {
		n -= 3;
		answer = 7;
	}
	for (; n > 0; n -= 2) {
		answer = answer * 10 + 1;
	}
	cout << answer << endl;
	return 0;
}