codeforces 651A python

若两个操纵杆的·电量都为1的话，那么持续时间为0

因此需要特别判断：一个操纵杆电量必须大于1，另一个>=1

joystick = map(int,raw_input().split())

result = 0
while True:
if (joystick[0] >= 1 and joystick[1] > 1) or (joystick[0]>1 and joystick[1] >=1):
joystick = sorted(joystick)
joystick[0] += 1
joystick[1] -= 2
result += 1

else:
break

print result