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 c = n / 2;
		if(c >= 2){
			for(int i = 1;i < c;++i){
				m += Math.pow(10, i);
			}
			switch(n % 2){
			case 0:
				m += 1;
				break;
			case 1:
				m += 7;
				break;
			}
		}else{
			switch(n){
			case 2:
				m = 1;
				break;
			case 3:
				m = 7;
				break;
			}
		}
		
		System.out.println(m);
	}
}