import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int[] x = new int[6];
    for(int i=0; i<6; i++){
      x[i] = sc.nextInt();
    }
    if(x[4]-x[0]<=x[5]){
      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