Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| # | Title | English Translation | Original Album | Length |
| --- | --- | --- | --- | --- |
| 1 | Mimpi Yang Sempurna | A Perfect Dream | Kisah 2002 Malam | 4:30 |
| 2 | Bintang Di Surga | Stars in The Heaven | Bintang Di Surga |  |
| 3 | Aku Dan Bintang | The Stars and Me | Taman Langit | 3:39 |
| 4 | Jauh Mimpiku | Distant Dreams of Mine | OST. Alexandria |  |
| 5 | Hari Yang Cerah Untuk Jiwa Yang Sepi | A Bright Day for A Lonely Soul | Hari Yang Cerah | 3:59 |
| 6 | Menunggu Pagi | Waiting For Dawn | OST. Alexandria |  |
| 7 | Khayalan Tingkat Tinggi | High-Level Imagination | Bintang Di Surga |  |
| 8 | Sahabat | Best Friend | Taman Langit | 4:33 |
| 9 | Sally Sendiri | Sally Alone | Hari Yang Cerah | 4:17 |
| 10 | Langit Tak Mendengar | The Sky Didn't Listen | OST. Alexandria |  |
| 11 | Di Belakangku | Behind Me | Bintang Di Surga |  |
| 12 | Kita Tertawa | We Laugh | Taman Langit | 3:29 |
| 13 | Membebaniku | Burdening Me | OST. Alexandria | 4:25 |
| 14 | Cobalah Mengerti | Try To Understand | Hari Yang Cerah | 3:30 |
| 15 | Topeng | Mask | Taman Langit | 4:25 |
Question:
how many songs listed were originally on ost. alexandria?
Answer:
4