#include <stdio.h>

int main( )
{
	int sum = 2;
	int fib[3] = { 1, 2, 3 };

	while(fib[2] < 4000000)
	{
		fib[2] = fib[0] + fib[1];
		if(fib[2] % 2 == 0)
			sum += fib[2];

		fib[0] = fib[1];
		fib[1] = fib[2];
	}
	printf( "%i", sum );
}