/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int ans;
		if(n % 2 == 1){
			ans = 7;
			n--;
		}
		else{
			ans = 1;
		}
		n = n-2;
		while(n > 0){
			ans = ans*10+1;
			n = n-2;
		}
		System.out.println(ans);
	}
}