import java.util.Scanner;

public class Main {

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