//Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed four million.
//every third Fibonacci number is even

	public void sumFibbonaci2() {
		long a, b, c;
		long sum = 0;
		a = b = 1;
		c = a + b;
		while (c < limit) {
			sum += c;
			a = b + c;
			b = c + a;
			c = a + b;
		}
		System.out.println(sum);
	}