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| (x,y)=[int(e) for e in raw_input("").split()]
data=[]
for i in range(x):
data.append([int(e) for e in list(raw_input(""))])
sum_value=[[0 for x_i in range(80)] for y_j in range(80)]
for i in range(x+1):
for j in range(y+1):
if i == 0 or j == 0:
sum_value[i][j] = 0
else:
sum_value[i][j] = sum_value[i-1][j] + sum_value[i][j-1] -sum_value[i-1][j-1] +data[i-1][j-1]
def get_data(x1,y1,x2,y2):
return sum_value[x2][y2]-sum_value[x1][y2]-sum_value[x2][y1]+sum_value[x1][y1]
def fentiandi(x_length,y_length,avg_value):
for index_i in range(1,y_length-2):
for index_j in range(index_i+1,y_length-1):
for index_k in range(index_j+1,y_length):
count_value = 0
pre_line_index=0
for x_index_i in range(1,x_length+1):
line1 = get_data(pre_line_index,0,x_index_i,index_i)
line2 = get_data(pre_line_index,index_i,x_index_i,index_j)
line3 = get_data(pre_line_index,index_j,x_index_i,index_k)
line4 = get_data(pre_line_index,index_k,x_index_i,y_length)
if line1 >= avg_value and line2 >= avg_value and line3 >= avg_value and line4 >= avg_value:
pre_line_index = x_index_i
count_value += 1
if count_value >= 4:
return True
return False
def get_min_value():
high=sum_value[x-1][y-1]
best_value=0
low=0
while low <= high:
middle=(low+high)/2
if fentiandi(x,y,middle) == True:
low=middle+1
best_value=middle
else:
high = middle-1
print best_value
get_min_value()
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