import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		String s="";
		if(n%2==0)s+="1";
		else s+="7";
		for(int i=0;i<n/2-1;i++){
			s+="1";
		}
		System.out.println(s);
	}
}