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

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

    def maxker(self):
        max = x[:].pop(0)
        for n in x:
            if n > max: max = n
        return max

    def feltmaxker(self, f):
        max, b = x[:].pop(0), False
        for n in x:
            if b:
                if f(n):
                    if n > max: max = n
            if not b:
                if f(n): max, b = n, True
        return max

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