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 ans = "", add = "";
		
		if (n % 2 == 0)
			cnt = n / 2;
		else {
			cnt = (n - 3) / 2;
			add = "7";
		}
		
		for (int i = 0; i < cnt; i++)
			ans += "1";
		
		System.out.println(add + ans);
	}
}