package yukicoder;

import java.util.Scanner;

public class Yuki83{
	
	public static void main(String[] args) {
				
		Scanner scan = new Scanner(System.in);
		int num = scan.nextInt();
		scan.close();
		int two_num = 0;
		int three_num = 0;
		String ans = "";
		
		
		if( num % 2 == 0){
			two_num = num / 2;
			ans = strNumbers(two_num,three_num);
		} else if(num % 2 == 1){
			two_num = (num / 2) -1;
			three_num ++;
			ans = strNumbers(two_num,three_num);
		}
		System.out.println(ans);
	}
	
	private static String strNumbers(int two_num,int three_num){
		String ans = "";
		
		if(three_num != 0) {
			for(int i =0; i < three_num; i++ ) {
				ans += "7"; 	
			}				
			for(int i =0; i < two_num; i++ ) {
				ans += "1"; 	
			}
		} else {	
			for(int i =0; i < two_num; i++ ) {
				ans += "1"; 	
			}
			for(int i =0; i < three_num; i++ ) {
				ans += "7"; 	
			}				
		}

		return ans;
	}
}