import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] a = new int[5];
        for(int i=0; i<5; i++) {
            a[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        
        String ans = "Yay!";
        for(int i=0; i<4; i++) {
            for(int j=i+1; j<5; j++) {
                if(a[j]-a[i] > k) {
                    ans = ":(";
                    break;
                }
            }
        }
        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