from numpy.linalg import det

def test(input, solution):
    # print(f"Running input {input}")
    result = process(input)
    print(f"Solution was {result}")
    assert result == solution

def run():
    file = open("input.txt", "r")
    return process(file.read()[:-1])


def process(input):
    points = []
    perimeter_area = 0
    current_point = (0,0)
    for line in input.split("\n"):
        dir_letter = {"2": "L", "0": "R", "1": "D", "3": "U"}[line.split()[2][7]]
        amount = int(line.split()[2][2:7], 16)
        direction = [amount * x for x in {"L": (0,-1), "R": (0,1), "D": (-1,0), "U": (1,0)}[dir_letter]]
        perimeter_area += amount
        current_point = [sum(x) for x in zip(current_point, direction)]
        points.append(current_point)
    indices = list(range(len(points) - 1)) + [-1]
    determinants = [det([[points[i][1], points[i+1][1]],[points[i][0], points[i+1][0]]]) for i in indices]
    return round(abs(sum(determinants))/2) + perimeter_area/2 + 1