import java.util.*;

public class HelloWorld
{
  public static void main( String[] args )
  {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int keta = 0;
    int i;

    for(i= N; i>5;){
      keta++;
      i = i-2;
      System.out.print("1");
    }

    if(i == 5){
      System.out.print("71");
    }
    else if(i==4){
      System.out.print("11");
    }
    else if(i==3){
      System.out.print("7");
    }
    else if(i==2){
      System.out.print("1");
    }

  }
}