import java.util.*;
class Main{
	public static void main(String[] args){
      Scanner sc = new Scanner(System.in);
      int min = sc.nextInt();
      sc.nextInt();sc.nextInt();sc.nextInt();
      int max = sc.nextInt();
      int limit = sc.nextInt();
      if(max-min<=limit)
        System.out.println("Yay!");
      else
        System.out.println(":(");
      return;
    }
}
/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