from functools import reduce
from operator import add

def floor(plan: str):
    return reduce(add, [1 if e == '(' else -1 for e in plan])

def test():
    assert floor("(())") == 0
    assert floor("()()") == 0

    assert floor("(((") == 3
    assert floor("(()(()(") == 3

    assert floor("))(((((") == 3

    assert floor("())") == -1
    assert floor("))(") == -1

    assert floor(")))") == -3
    assert floor(")())())") == -3

def solve():
    with open("in1") as puzzle:
        r = puzzle.read()

    return floor(r)


if __name__ == "__main__":
    print(f"Floor: {solve()}")