class Tetel:
    def __init__(self, f):
        global x
        f, x = open(f,'r'), []
        for l in f:
            try:
                x += [int(l)]
            except:
                pass

    def osszegez(self):
        sum = 0
        for n in x:
            sum = sum + n
        return sum

    def maxker(self):
        _max = max(x[:])
        return _max

    def feltmaxker(self, f):
        _max, b = [], False
        for n in x:
            if f(n):
                _max += [n]
        return max(_max)

    def szamlal(self, f):
        db = 0
        for n in x:
            if f(n): db = db + 1
        return db