27 задача ЕГЭ питон

with open('inf_26_04_21_27a.txt') as f:
    data = f.readlines()
 
n = int(data[0])
sum0, sum1 = 0, 0
min1, min2, min3 = 20001, 20001, 20001
for i in range(1, n+1):
    x, y = map(int, data[i].split())
    if y%2 == 1:
        if x > y:
            sum1 += y
            sum0 += x
            if y%2 == 1 and x%2 == 1 and (x+y) < min1: min1 = x + y
            if y%2 == 0 and x%2 == 1 and (x+y) < min2: min2 = x + y
            if y%2 == 1 and x%2 == 0 and (x+y) < min3: min3 = x + y
        else:
            sum1 += x
            sum0 += y
            if y%2 == 1 and x%2 == 1 and (x+y) < min1: min1 = x + y
            if x%2 == 0 and y%2 == 1 and (x+y) < min2: min2 = x + y
            if x%2 == 1 and y%2 == 0 and (x+y) < min3: min3 = x + y
if sum0%2 == 0 and sum1%2 == 1: print(sum0 + sum1)
elif sum0%2 == 1 and sum1%2 == 0:
    if min1 < min2 + min3:
        print(sum0 + sum1 - min1)
    else:
        print(sum0 + sum1 - min2 - min3)
elif sum0%2 == 1 and sum1%2 == 1:
    if min2 < min3 + min1:
        print(sum0 + sum1 - min2)
    else:
        print(sum0 + sum1 - min3 - min1)
elif sum0%2 == 0 and sum1%2 == 0:
    if min3 < min2 + min1:
        print(sum0 + sum1 - min3)
    else:
        print(sum0 + sum1 - min2 - min1)