arr1 = [['#','#','#','#','#'],
['#','*','*','#','#'],
['#','#','#','*','#'],
['#','*','*','#','#'],
['#','#','#','#','#']]

arr2 = [['#','#','#','#','#','#','#','#','#','#'],
['#','-','-','-','*','-','-','*','#','#'],
['#','#','#','-','*','-','-','-','-','#'],
['#','*','*','#','#','#','#','#','#','#'],
['#','#','*','*','*','-','-','-','#','#'],
['#','#','#','#','#','#','#','#','#','#']]

def fun(n,m,arr):
    persons = 0
    rooms = 0
    for i in range(n):
        for j in range(m):
            if arr[i][j] != '#':
                if arr[i][j] == "*":
                    persons += 1
                if arr[i-1][j] != '#' or arr[i][j-1] != '#' or arr[i+1][j] != '#' or arr[i][j+1] != '#':
                    arr[i][j] = '#'
                else:
                    rooms += 1
                    arr[i][j] = '#'
    if rooms > 0:
        return persons/rooms
    else:
        return False


print(fun(5,5,arr1))
print(fun(6,10,arr2))