#include <iostream>
using namespace std;
int evenfibonacci()
{
int result = 2;
int last[2] = {1, 2};
for (int k = 3; k <= 33; ++k) {
int value = last[0] + last[1];
if (value % 2 == 0) {
result += value;
}
last[0] = last[1];
last[1] = value;
}
return result;
}
int main()
{
cout << evenfibonacci();
}
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