#!/bin/python3
HOUR_GLASS = [[1, 1, 1], [0, 1, 0], [1, 1, 1]]

def multiply(a, b):
  result = 0
  for i in range(len(a)):
    for j in range(len(a[0])):
      result += a[i][j] * b[i][j]
  return result


A = []
for _ in range(6):
   row = [int(element) for element in input().strip().split(' ')]
   A.append(row)

results = []
steps = len(A[0]) - len(HOUR_GLASS[0]) + 1

for i in range(steps):
  for j in range(steps):
    sub = [row[j:j+3] for row in A[i:i+3]]
    results.append(multiply(sub, HOUR_GLASS))

print(max(results))