public void CountPrimes5()
        {
            //Arrange
            int n        = 11474836;
            int expected = 755764;

            //Act
            Solution204 s      = new Solution204();
            int         actual = s.CountPrimes(n);

            //Assert
            Assert.Equal(expected, actual);
        }
        public void CountPrimes3()
        {
            //Arrange
            int n        = 2;
            int expected = 0;

            //Act
            Solution204 s      = new Solution204();
            int         actual = s.CountPrimes(n);

            //Assert
            Assert.Equal(expected, actual);
        }