#include <stdio.h>


int main (int argc, const char * argv[]) {


    int i, j, k, sum1, sum2;
    sum1 = 1;
    j = 1;

    for (i = 1; sum1 < 4000000; i++) {
        k = j;
        j = sum1;
        sum1 = k + j;
        if (( sum1 % 2 ) == 0)
        sum2 += sum1;

    }

            printf("%d\n", sum2);


    return 0;

}