package yukicoder;

import java.util.Scanner;

public class N83 {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = 0;
		int c1 = 0;
		int c2 = 0;
		if(n % 2 == 0){
			c1 = n / 2;
			for(int i = 0;i < c1;++i){
				m += Math.pow(10, i);
			}
		}else{
			c1 = n / 2 - 1;
			c2 = 1;
			m += 7 * Math.pow(10, c1);
			for(int i = 0;i < c1;++i){
				m += Math.pow(10, i);
			}
		}
		
		System.out.println(m);
	}
}