15 lines
282 B
Python

def gen():
a = 1 # for all
b = 1 # for blue
while True:
yield (a + 1) // 2, (b + 1) // 2
a, b = 3 * a + 4 * b, 2 * a + 3 * b
def search(limit):
for a, b in gen():
if a > limit:
return b
print(search(int(10 ** 12)))