cstutoringcenter.com_Midpoint Sums

def midpoint(input):
    cor0 = input.split("|")[0].split(",")
    cor1 = input.split("|")[1].split(",")
    return ((float(cor0[0])+int(cor1[0]))/2), ((float(cor0[1])+int(cor1[1]))/2)
sum = 0
for x in open("plane22.txt", "r"):
    sum += midpoint(x)[1]
print sum