import java.util.*;
 
class Main {
 
  public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  }
 
}

/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