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:
| State | Highest point | Highest elevation | Lowest point | Lowest elevation | Mean elevation |
| --- | --- | --- | --- | --- | --- |
| Alabama | Cheaha Mountain | ft m | Gulf of Mexico | sea level | ft m |
| Alaska | Mount McKinley | ft m | Gulf of Alaska , Bering Sea , and Arctic Ocean | sea level | ft m |
| Arizona | Humphreys Peak | ft m | Colorado River at Sonora border, San Luis, Arizona | ft m | ft m |
| Arkansas | Magazine Mountain | ft m | Ouachita River at Louisiana border | ft m | ft m |
| California | Mount Whitney | ft m | Badwater Basin in Death Valley | ft m | ft m |
| Colorado | Mount Elbert | ft m | Arikaree River at Kansas border | ft m | ft m |
| Delaware | Near the Ebright Azimuth | ft m | Atlantic Ocean | sea level | ft m |
| District of Columbia | Fort Reno | ft m | Potomac River at eastern Maryland border | ft m | ft m |
| Florida | Britton Hill | ft m | Atlantic Ocean and Gulf of Mexico | sea level | ft m |
| Georgia | Brasstown Bald | ft m | Atlantic Ocean | sea level | ft m |
| Hawai ʻ i | Mauna Kea on the Island of Hawai ʻ i | ft m | Pacific Ocean | sea level | ft m |
| Idaho | Borah Peak | ft m | Confluence of Snake River and Clearwater River | ft m | ft m |
| Illinois | Charles Mound | ft m | Confluence of Mississippi River and Ohio River | ft m | ft m |
| Indiana | Hoosier Hill | ft m | Confluence of Ohio River and Wabash River | ft m | ft m |
| Kansas | Mount Sunflower | ft m | Verdigris River at Oklahoma border | ft m | ft m |
| Kentucky | Black Mountain | ft m | Mississippi River at Kentucky Bend | ft m | ft m |
| Louisiana | Driskill Mountain | ft m | Winnrock Quarry, Winn Parish | ft m | ft m |
| Maine | Mount Katahdin | ft m | Atlantic Ocean | sea level | ft m |
| Maryland | Hoye-Crest | ft m | Atlantic Ocean | sea level | ft m |
| Massachusetts | Mount Greylock | ft m | Atlantic Ocean | sea level | ft m |
| Michigan | Mount Arvon | ft m | Lake Erie | ft m | ft m |
| Minnesota | Eagle Mountain | ft m | Lake Superior | ft m | ft m |
| Mississippi | Woodall Mountain | ft m | Gulf of Mexico | sea level | ft m |
| Missouri | Taum Sauk Mountain | ft m | Saint Francis River at southern Arkansas border | ft m | ft m |
| Montana | Granite Peak | ft m | Kootenai River at Idaho border | ft m | ft m |
| Nebraska | Panorama Point | ft m | Missouri River at Kansas border | ft m | ft m |
| Nevada | Boundary Peak | ft m | Colorado River at California border | ft m | ft m |
| New Hampshire | Mount Washington | ft m | Atlantic Ocean | sea level | ft m |
| New Jersey | High Point | ft m | Atlantic Ocean | sea level | ft m |
| New Mexico | Wheeler Peak | ft m | Red Bluff Reservoir on Texas border | ft m | ft m |
| New York | Mount Marcy | ft m | Atlantic Ocean | sea level | ft m |
| North Carolina | Mount Mitchell | ft m | Atlantic Ocean | sea level | ft m |
| North Dakota | White Butte | ft m | Red River of the North at Manitoba border | ft m | ft m |
| Ohio | Campbell Hill | ft m | Ohio River at Indiana border | ft m | ft m |
| Oklahoma | Black Mesa | ft m | Little River at Arkansas border | ft m | ft m |
| Oregon | Mount Hood | ft m | Pacific Ocean | sea level | ft m |
| Pennsylvania | Mount Davis | ft m | Delaware River at Delaware border | sea level | ft m |
| Rhode Island | Jerimoth Hill | ft m | Atlantic Ocean | sea level | ft m |
| South Carolina | Sassafras Mountain | ft m | Atlantic Ocean | sea level | ft m |
| South Dakota | Harney Peak | ft m | Big Stone Lake on Minnesota border | ft m | ft m |
| Tennessee | Clingmans Dome | ft m | Mississippi River at Mississippi border | ft m | ft m |
| Texas | Guadalupe Peak | ft m | Gulf of Mexico | sea level | ft m |
| Utah | Kings Peak | ft m | Beaver Dam Wash at Arizona border | ft m | ft m |
| Vermont | Mount Mansfield | ft m | Lake Champlain | ft m | ft m |
| Virginia | Mount Rogers | ft m | Atlantic Ocean | sea level | ft m |
| Washington | Mount Rainier | ft m | Pacific Ocean | sea level | ft m |
| West Virginia | Spruce Knob | ft m | Potomac River at Virginia border | ft m | ft m |
| Wisconsin | Timms Hill | ft m | Lake Michigan | ft m | ft m |
| Wyoming | Gannett Peak | ft m | Belle Fourche River at South Dakota border | ft m | ft m |
Question:
what's the lowest point with highest point being mount greylock
Answer:
Atlantic Ocean