#include "stdio.h"

#define STEP 4000000

main () {
	
	long int sum;
	int one, two, three;

	one=1;
	two=2;
	three = 0;
	sum = 0;
	while (two <= STEP){

		three = one + two;
//		printf ("%i,", three);

		if ( (two % 2 ) == 0)
			sum += two;	
//		printf ("sum is now: %lu\n", sum);
		one = two;
		two = three;



	}

	printf ("Sum = %lu\n", sum);

	return 0;
}