828 B | 828 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
a, b, c, d = mii()
ans = 0
a %= 2
c %= 2
k = min(b, d)
b -= k
d -= k
k = min(a, b)
a -= k
b -= k
ans += k
k = min(a, d)
a -= k
d -= k
ans += k
k = min(b, c)
b -= k
c -= k
ans += k
k = min(c, d)
c -= k
d -= k
ans += k
k = min(a, c)
a -= k
c -= k
ans += 2 * k
ans += b
ans += d
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()