i = 2
x = 1
y = 2
a = 0
while y < 4000000:
a = x + y
if a % 2 == 0:
i = i + a
print i
x = y
y = a
aSA9IDIKeCA9IDEKeSA9IDIKYSA9IDAKIAogCndoaWxlIHkgPCA0MDAwMDAwOgogICAgYSA9IHggKyB5CiAgICBpZiBhICUgMiA9PSAwOgogICAgICAgIGkgPSBpICsgYQogICAgICAgIHByaW50IGkKICAgIHggPSB5CiAgICB5ID0gYQ==