def zeroseq(line):
    line = str(line)
    return (len(max(line.split('1'), key = len)))
ans = 0
lst0 = lst1 = lst2 = lst3 = lst4 = lst5 = lst6 = lst7 = lst8 = lst9 = []
for i in range(10):
    a = input()
    a = a.replace(' ', '')
    x = zeroseq(a)
    if x > ans:
        ans = x
    if i == 0:
        lst0.append(a[i])
    elif i == 1:
        lst1.append(a[i])
    elif i == 2:
        lst2.append(a[i])
    elif i == 3:
        lst3.append(a[i])
    elif i == 4:
        lst4.append(a[i])
    elif i == 5:
        lst5.append(a[i])
    elif i == 6:
        lst6.append(a[i])
    elif i == 7:
        lst7.append(a[i])
    elif i == 8:
        lst8.append(a[i])
    elif i == 9:
        lst9.append(a[i])
if zeroseq(lst0) > ans:
    ans = zeroseq(lst0)
if zeroseq(lst1) > ans:
    ans = zeroseq(lst1)
if zeroseq(lst2) > ans:
    ans = zeroseq(lst2)
if zeroseq(lst3) > ans:
    ans = zeroseq(lst3)
if zeroseq(lst4) > ans:
    ans = zeroseq(lst4)
if zeroseq(lst5) > ans:
    ans = zeroseq(lst5)
if zeroseq(lst6) > ans:
    ans = zeroseq(lst6)
if zeroseq(lst7) > ans:
    ans = zeroseq(lst7)
if zeroseq(lst8) > ans:
    ans = zeroseq(lst8)
if zeroseq(lst9) > ans:
    ans = zeroseq(lst9)
print(ans)