def c(data):
    v = [[e['login'] for e in data], [e['logout'] for e in data]]
    t = [Counter(v[0]), Counter(v[1])]
    tmp = Counter()
    allt = list(set((v[0] + v[1])))
    allt.sort()
    ret = []
    cp = 0
    for e in allt:
        cp += t[0][e]
        cp -= t[1][e]
        ret.append(cp)
    return max(ret)
def c(data):
    v = [[e['login'] for e in data], [e['logout'] for e in data]]
    t = [Counter(v[0]), Counter(v[1])]
    tmp = Counter()
    allt = list(set((v[0] + v[1])))
    allt.sort()
    ret = []
    cp = 0
    for e in allt:
        cp += t[0][e]
        cp -= t[1][e]
        ret.append(cp)
    return max(ret)