if coin != 1 and coin != 5 and coin != 10 and coin != 25:
        print("Invalid coin, try again!\n")
        continue
    total_inserted += coin
    coins_inserted += 1
    print(f"Inserted {coin}. Total so far: {total_inserted}\n")

    if total_inserted >= snack_price:
        print("Enough money inserted!\n")
        break
change_due = calculate_change(total_inserted, snack_price)

print("Dispensing your snack...")

if change_due == 0:
    pass
else:
    print(f"Here is your change: {change_due} units")
print("\n===== PURCHASE SUMMARY =====")
print("Snack Price:", snack_price)
print("Coins Inserted:", coins_inserted)
print("Total Paid:", total_inserted)
print("Change Given:", change_due)
print("=============================")
print("Thanks for your purchase!")
# End of program