import java.util.*;

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

        int[] x = new int[5];

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

        int k = sc.nextInt();

        if(x[4]-x[0]>k){
            System.out.println(":(");
        }
        else if(x[4]-x[0]<=k){
            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