The input is a natural number n — the number of rows and columns in the matrix, the number of matrix elements (integers) line by line separated by a space. draw the maximum element below the main diagonal

def max_element(n):
  matrix = []
  for i in range(n):
    matrix.append([int(x) for x in input().split()])
  max_elem = 0
  for i in range(n):
    for j in range(n):
      if i > j:
        if matrix[i][j] > max_elem:
          max_elem = matrix[i][j]
  return max_elem

print(max_element(int(input())))