#include <iostream>
using namespace std;

int main()
{
    int fib1=1, fib2=1, fibSum, total;
    while (fibSum < 4000000)
    {
        fibSum = fib1 + fib2;
        if (fibSum % 2 == 0)
            total += fibSum;
        fib1 = fib2;
        fib2 = fibSum;
    }
    if (total > 4000000)
        total -= fibSum;
    cout << total;
}

#include <iostream>
using namespace std;

bool checkEven(int number)
{
    if (number % 2 == 0)
        return true;
    else
        return false;
}

struct sequence
{
    int one, two, sum, total;
};

int main()
{
    sequence fib;
    fib.one=1, fib.two=1, fib.total=0;
    while (fib.total < 4000000)
    {
        fib.sum = fib.one + fib.two;
        if (checkEven(fib.sum) == true)
            fib.total += (fib.one + fib.two);
        fib.one = fib.two;
        fib.two = fib.sum;
    }
    cout << fib.total;
}

#include <iostream>
using namespace std;

int main()
{
    int fib1=1, fib2=1, fibSum=0, total=0;
    while (fibSum < 4000000)
    {       
        if (fibSum % 2 == 0)
            total += fibSum;
        fibSum = fib1 + fib2;
        fib1 = fib2;
        fib2 = fibSum;
    }
    cout << total;
}