import java.util.Scanner;
class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int max = 0;
    int min = 123;
    int input;
    for(int i = 0; i < 5; i++){
      input = sc.nextInt();
      max = Math.max(max,input);
      min = Math.min(min,input);
    }
    int k = sc.nextInt();
    if(k >= max - min){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
}
/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