import java.util.*;

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

    int[] list = new int[6];
    for (int i = 0; i < 6 ; i++ ) {
      list[i] = sc.nextInt();
    }

    int a = list[0];
    int e = list[4];
    int k = list[5];

    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