#include <objc/Object.h>

int main(int argc, char ** argv) {
	int i, last, current, sum, tmp;
	sum = 0;
	last = 0;
	for(current = 1; current < 4000000; tmp = current, current = last + current, last = tmp) {
		if ( current % 2 == 0) 
			sum += current;
	}
	printf("%d\n", sum);
}