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

    int Na = sc.nextInt();
    int Nb = sc.nextInt();
    int Nc = sc.nextInt();
    int Nd = sc.nextInt();
    int Ne = sc.nextInt();
    int k = sc.nextInt();
   	if(Ne-Na<=k)System.out.println("Yay!");
    else System.out.println(":(");
 }
}
/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