import java.util.*;

class Main{
  public static void main(String[] args){
    try(Scanner sc = new Scanner(System.in)){
      int a = Integer.parseInt(sc.nextLine());
      int b = Integer.parseInt(sc.nextLine());
      int c = Integer.parseInt(sc.nextLine());
      int d = Integer.parseInt(sc.nextLine());
      int e = Integer.parseInt(sc.nextLine());
      int k = Integer.parseInt(sc.nextLine());
      if((e - a) > k){
        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