day9part1

points = []
with open("day9_input.txt") as f:
    line = f.readline()
    while line:
        points.append(tuple([int(n) for n in line.split(',')]))
        line = f.readline()

def area(c1, c2):
    x1, y1 = c1
    x2, y2 = c2
    return (abs(x1-x2)+1)*(abs(y1-y2)+1)

largest = 0
for i, c1 in enumerate(points):
    for c2 in points[i+1:]:
        largest = max(largest, area(c1,c2))

print(largest)