import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        // 整数の入力
        int[] a=new int[5];
        for(int i=0;i<5;i++){
          a[i] = sc.nextInt();
        }
        int k = sc.nextInt();
        int flag=0;
        for(int i=0;i<4;i++){
          for(int j=i+1;j<5;j++){
            flag+=(a[j]-a[i])>k?1:0;
          }
        }
        // 出力
        System.out.println(flag>0?":(":"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