import java.util.*;

class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int minNum = sc.nextInt();
        sc.nextInt();
        sc.nextInt();
        sc.nextInt();
        int maxNum = sc.nextInt();
        int limit = sc.nextInt();

        String ans;
        if(maxNum - minNum > limit){
            ans = ":(";
        }else{
            ans = "Yay!";
        }
        System.out.println(ans);
    }
}
/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