public void Solution()
        {
            /*
             * By listing the set of reduced proper fractions for
             * d ≤ 1,000,000 in ascending order of size,
             * find the numerator of the fraction immediately to the left of 3/7.
             */



            var sut = new E071OrderedFractions();

            Assert.Equal(428570, sut.GetNumeratorLeftOf(dmax: 1000000, rightNumerator: 3, rightDenominator: 7));

            /*
             * Congratulations, the answer you gave to problem 71 is correct.
             * You are the 25498th person to have solved this problem.
             * This problem had a difficulty rating of 10%.
             */
        }
        public void Test_1()
        {
            var sut = new E071OrderedFractions();

            Assert.Equal(2, sut.GetNumeratorLeftOf(dmax: 8, rightNumerator: 3, rightDenominator: 7));
        }