import java.util.*;

public class Main {
	public static void main(String[] args) {

		int o,p,q;
		int a = 0, b = 0,c=0;
		
		Scanner sc  = new Scanner(System.in);
//		int[] test  = new int[100000];
//  		int[] test2 = new int[1000];
		
	//  String str1 = sc.next();
	  int	t = Integer.parseInt(sc.next());
	  
	  b = t;
		String s = "";
		
			if(b%2==1){
				 s += "7";
				 b-=3;
					
				}
	  
	  while(true){
			
	     if(b==0||b==1)break;
		  
		 if(b%2==0){
		
			  s += "1";
	
			      b /= 2;

			
				
				 		
		  }
		 
		 
	

	 
	  }
	  

	//  String str2 = sc.next();
	
	 /*   
	  int	s = Integer.parseInt(sc.next());
	  int	t = Integer.parseInt(sc.next());
	  int	u = Integer.parseInt(sc.next());
		*/

		
   /*
      int d = 0;
    　　　　while(true){
		
       int	v = Integer.parseInt(sc.next());
       test2[d] = v ;
     	d++;
		}
		
		*/
/*
	  for(int i=0;i<c1.length;i++){
			if(c1[i]!=c2[i]){
				System.out.println("NO");
				return;
			}
		}
		*/
	      System.out.println(s);
		  System.out.println();
	}
}