import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int n = koko.nextInt();
        if(n%2==0){
            int lg = n/2;
            for(int i=0; i<lg-1; i++){
                System.out.print(1);
            }
            System.out.println(1);
        }else{
            int lk =(n-3)/2;
            System.out.print(7);
            if(n-3>0){
               for(int i=0; i<lk-1; i++){
                System.out.print(1);
               }
               System.out.println(1);
            }
        }
    }
}