#include<iostream>
using namespace std;
int main()
{
int x,y,z;
x=0;
y=1;
int sum = 0;
int i =0;
while (i<=4000000)
{
z = x+y;
if (z%2==0)
{
sum = sum +z;
}
x = y;
y = z;
i = i + 1;
}
cout<<sum;
return 0;
}
I2luY2x1ZGU8aW9zdHJlYW0+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CmludCBtYWluKCkKewoJaW50IHgseSx6OwoJeD0wOwoJeT0xOwoJaW50IHN1bSA9IDA7CglpbnQgaSA9MDsKCXdoaWxlIChpPD00MDAwMDAwKQoJewoJCXogPSB4K3k7CgkJaWYgKHolMj09MCkKCQl7CgkJCXN1bSA9IHN1bSArejsKCQl9CgkJeCA9IHk7CgkJeSA9IHo7CgkJaSA9IGkgKyAxOwoJfQoJY291dDw8c3VtOwoJcmV0dXJuIDA7Cn0K