import java.util.Scanner;

class Main {
	public static void main(String... args) {
		Scanner sc = new Scanner(System.in);
		int matchQty = sc.nextInt();
		System.out.println(matchNum(matchQty));
	}

	public static int matchNum(int matchQty) {
		String ans = "";
		if (matchQty % 2 == 0) {
			for (int i = 0; i < matchQty / 2; i++) {
				ans += "1";
			}
		} else {
			ans += "7";
			matchQty -= 3;
			for (int i = 0; i < matchQty / 2; i++) {
				ans += "1";
			}
		}
		return Integer.parseInt(ans);

	}
}