761 B | 761 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 f(n, m):
if n <= 0 or m <= 0:
return 0
if n % 2 == 0 or m % 2 == 0:
return 0
if n == 1 and m == 1:
return 1
if n == 1:
return 1 + 2 * f(n, (m - 3) // 2)
if m == 1:
return 1 + 2 * f((n - 3) // 2, m)
return 1 + 4 * f(n // 2, m // 2)
def solve():
n, m = mii()
p(f(n, m))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()