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:
| Township | FIPS | Population\ncenter | Population | Population\ndensity\n/km² (/sq mi) | Land area\nkm² (sq mi) | Water area\nkm² (sq mi) | Water % | Geographic coordinates |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Ash Creek | 02575 |  | 58 | 1 (2) | 93 (36) | 0 (0) | 0.51% | 38°39′17″N 98°12′47″W﻿ / ﻿38.65472°N 98.21306°W |
| Black Wolf | 07025 |  | 87 | 1 (2) | 94 (36) | 0 (0) | 0.10% | 38°44′40″N 98°19′33″W﻿ / ﻿38.74444°N 98.32583°W |
| Carneiro | 10800 |  | 57 | 1 (2) | 93 (36) | 0 (0) | 0.36% | 38°45′2″N 97°59′46″W﻿ / ﻿38.75056°N 97.99611°W |
| Clear Creek | 13725 |  | 91 | 1 (3) | 94 (36) | 0 (0) | 0.17% | 38°44′10″N 98°6′16″W﻿ / ﻿38.73611°N 98.10444°W |
| Columbia | 15025 |  | 60 | 1 (2) | 94 (36) | 0 (0) | 0.04% | 38°50′5″N 98°18′50″W﻿ / ﻿38.83472°N 98.31389°W |
| Ellsworth | 20525 |  | 797 | 9 (23) | 88 (34) | 0 (0) | 0.23% | 38°43′6″N 98°10′58″W﻿ / ﻿38.71833°N 98.18278°W |
| Empire | 21150 |  | 174 | 1 (3) | 171 (66) | 14 (6) | 7.79% | 38°39′6″N 98°1′7″W﻿ / ﻿38.65167°N 98.01861°W |
| Garfield | 25575 |  | 27 | 0 (1) | 92 (36) | 0 (0) | 0.30% | 38°50′9″N 98°6′42″W﻿ / ﻿38.83583°N 98.11167°W |
| Green Garden | 28600 | Lorraine | 211 | 2 (6) | 94 (36) | 0 (0) | 0.22% | 38°33′30″N 98°19′19″W﻿ / ﻿38.55833°N 98.32194°W |
| Langley | 38600 |  | 76 | 1 (2) | 92 (35) | 2 (1) | 1.86% | 38°35′33″N 97°58′15″W﻿ / ﻿38.59250°N 97.97083°W |
| Lincoln | 40675 |  | 62 | 1 (2) | 95 (37) | 0 (0) | 0.22% | 38°39′8″N 98°18′0″W﻿ / ﻿38.65222°N 98.30000°W |
| Mulberry | 49050 |  | 44 | 0 (1) | 93 (36) | 0 (0) | 0.24% | 38°50′5″N 97°58′28″W﻿ / ﻿38.83472°N 97.97444°W |
| Noble | 50825 |  | 90 | 1 (3) | 93 (36) | 0 (0) | 0.04% | 38°44′51″N 98°25′33″W﻿ / ﻿38.74750°N 98.42583°W |
| Palacky | 54100 |  | 63 | 1 (2) | 94 (36) | 0 (0) | 0.08% | 38°38′51″N 98°25′56″W﻿ / ﻿38.64750°N 98.43222°W |
| Sherman | 64950 |  | 65 | 1 (2) | 94 (36) | 0 (0) | 0.22% | 38°49′21″N 98°13′7″W﻿ / ﻿38.82250°N 98.21861°W |
| Thomas | 70450 |  | 72 | 1 (2) | 93 (36) | 0 (0) | 0.21% | 38°33′56″N 98°11′33″W﻿ / ﻿38.56556°N 98.19250°W |
| Trivoli | 71525 |  | 55 | 1 (2) | 93 (36) | 0 (0) | 0.38% | 38°35′7″N 98°4′23″W﻿ / ﻿38.58528°N 98.07306°W |
| Valley | 72800 | Holyrood | 577 | 6 (16) | 93 (36) | 0 (0) | 0.14% | 38°34′22″N 98°24′56″W﻿ / ﻿38.57278°N 98.41556°W |
| Wilson | 79700 | Wilson | 894 | 10 (25) | 93 (36) | 0 (0) | 0.06% | 38°49′34″N 98°27′23″W﻿ / ﻿38.82611°N 98.45639°W |
Question:
how many townships have at least a 0.50 water percentage?
Answer:
3