import java.io.*;

class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = br.readLine();
        int a = Integer.parseInt(str);
        str = br.readLine();
        int b = Integer.parseInt(str);
        str = br.readLine();
        int c = Integer.parseInt(str);
        str = br.readLine();
        int d = Integer.parseInt(str);
        str = br.readLine();
        int e = Integer.parseInt(str);
        str = br.readLine();
        int k = Integer.parseInt(str);
        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