№24 — #2419

text = open('24_2419.txt').read().strip()
ops = '-*'
end_op = 0
zero = nonzero = 0
best = 0
for ch in text:
    if ch in ops:
        m = max(zero, nonzero)
        end_op = m + 1 if m else 0
        zero = nonzero = 0
    else:
        if ch == '0':
            new_zero = max(1, end_op + 1 if end_op else 0)
            new_nonzero = nonzero + 1 if nonzero else 0
        else:
            new_zero = 0
            new_nonzero = max(1, end_op + 1 if end_op else 0, nonzero + 1 if nonzero else 0)
        zero, nonzero = new_zero, new_nonzero
        end_op = 0
        best = max(best, zero, nonzero)
print(best)