import java.io.*;
import java.util.*;

class Main155 {
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		int cnt = 0;
		String add = "", ans = "";
		if (n % 3 == 0)
			cnt = n / 3;
		else if (n % 3 == 1) {
			cnt = (n - 4) / 3;
			add = "11";
		} else {
			cnt = n / 3;
			add = "1";
		}
		for (int i = 0; i < cnt; i++)
			ans += "7";
		
		System.out.println(ans + add);
	}
}