import java.util.*;

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

    int[] array = new int[5];
    for(int i=0; i<5; i++){
      array[i] = sc.nextInt();
    }

    int k = sc.nextInt();

    int sub = array[4] - array[0];

    if(sub>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