array = [ [int(i) for i in input().split()] for j in range(10)]

maxLen = 0
for i in range(10):
    curLen = 0
    for j in range(10):
        if array[i][j]==0:
            curLen+=1
        else:
            if curLen>maxLen:
                maxLen = curLen
            curLen = 0
    if curLen>maxLen:
        maxLen = curLen

for i in range(10):
    curLen = 0
    for j in range(10):
        if array[j][i]==0:
            curLen+=1
        else:
            if curLen>maxLen:
                maxLen = curLen
            curLen = 0
    if curLen>maxLen:
        maxLen = curLen

print(maxLen)