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:
| Name | Municipality | Established | Tower height\nin meters (ft) | Focal plane\nin meters (ft) | Current status | Current condition |
| --- | --- | --- | --- | --- | --- | --- |
| Los Morrillos Light | Cabo Rojo | 1882 | 12 m (40 ft.) | 37 m (121 ft) | Active | Restored for tourism |
| Punta Higuero Light | Rincón | 1892 | 21 m (69 ft) | 27 m (90 ft) | Active | It has been fully restored and is part of the El Faro Park, a tourist and recreation center. |
| Punta Borinquen Light | Aguadilla | 1892 | 18 m (60 ft) | 89 m (292 ft) | Active | Operational |
| Arecibo Light | Arecibo | 1898 | 14 m (46 ft) | 36 m (120 ft) | Active | Restored for tourism |
| Port San Juan Light | San Juan | 1846 | 15.5 m (51 ft) | 55 m (181 ft) | Active | Restored for tourism. Also known as El Morro, Faro de Morro or Faro del Castillo del Morro or Puerto San Juan Light. |
| Cape San Juan Light | Fajardo | 1880 | 14 m (45 ft) | 79 m (260 ft) | Active | Restored for tourism |
| Guánica Light | Guanica | 1893 | N/A | N/A | Inactive | Ruins |
| Cardona Island Light | Ponce | 1889 | 11 m (36 ft) | 14 m (46 ft) | Active | Good |
| Caja de Muertos Light | Ponce | 1887 | 19 m (63 ft) | 91 m (297 ft) | Active | Restored for tourism |
| Punta de las Figuras Light | Arroyo | 1893 | 15 m (50 ft) | N/A | Inactive | Restored for tourism |
| Punta Tuna Light | Maunabo | 1892 | 15 m (49 ft) | 34 m (111 ft) | Active | Restored for tourism |
| Mona Island Light | Mayagüez\n(Mona Island) | 1900 | 16 m (52 ft) | N/A | Inactive | Its condition is considered dire. Unless restored soon, many considered the lighthouse lost. |
| Punta Mulas Light | Vieques | 1896 | 10 m (32 ft) | 21 m (68 ft.) | Active | Restored for tourism |
| Puerto Ferro Light | Vieques | 1896 | N/A | N/A | Inactive | Abandoned and deteriorating rapidly |
| Culebrita Island Light | Culebra | 1886 | 13 m (43 ft) | 93 m (305 ft) | Active | In Ruins |
| Cabras Island Light | Ceiba | 1908 | N/A | N/A | Destroyed | Abandoned in 1965 and destroyed in 1966 |
Question:
how many towers are at least 18 meters tall?
Answer:
3