import java.util.Scanner;

public class Main{
  public static void main(String[]args){
    Scanner sc=new Scanner(System.in);
    int a[]=new int[5];
    for(int s=0;s<5;s++){
      a[s]=sc.nextInt();
    }
    int count=0;
    int k=sc.nextInt();
    for(int s=0;s<4;s++){
      for(int l=s+1;l<5;l++){
        if(a[l]-a[s]>k){
          count++;
        }
      }
    }
    if(count>0){
      System.out.println(":(");
    }else{
      System.out.println("Yay!");
    }
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz