#925. Largest island
On a map of `1` and `0`, find the area (number of cells) of the largest island. If there are no islands, print 0.
### Input
n m, then n lines.
### Output
A number.
Examples
Input
2 7 0011010 0101110
Output
6
Input
7 4 0011 1000 0111 0001 1011 1100 0011
Output
6
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.