class Solution:
    def numSpecial(self, mat: List[List[int]]) -> int:
        ans = 0
        m = len(mat)
        n = len(mat[0])

        for row in range(m):
            for col in range(n):
               if mat[row][col] == 0:
                   continue
               
               good = True
               for r in range(m):
                   if r != row and mat[r][col] == 1:
                       good = False
                       break
               
               for c in range(n):
                   if c != col and mat[row][c] == 1:
                       good = False
                       break
               
               if good:
                   ans += 1
                   
        return ans