#include "iostream"
using namespace std;

int N;

int main() {
	cin >> N;
	if (N % 2 == 1) {
		for (int i = 1; i < N / 2-1; i++) {
			cout << "1";
		}
		cout << "7";
	}
	else {
		for (int i = 1; i < N / 2; i++) {
			cout << "1";
		}
	}
	cout << "\n";
	return 0;
}