public static int Solution()
{
return(FibonacciSequence.SequenceBy(4000000).Where(x => x % 2 == 0).Sum());
}
//-----------------------------------------------------------------
//By considering the terms in the Fibonacci sequence whose values
//do not exceed four million, find the sum of the even-valued terms.
//Answer: 4613732
//-----------------------------------------------------------------
public override long Solve()
{
var sequence = FibonacciSequence.GenerateSequenceBelow(4000000);
return(CalculateEvenTermsSum(sequence));
}