public void SampleTest()
 {
     Assert.Equal(30, Kata.SumTimesTable(new List <int> {
         2, 3
     }, 1, 3));
     Assert.Equal(9, Kata.SumTimesTable(new List <int> {
         1, 3, 5
     }, 1, 1));
     Assert.Equal(495, Kata.SumTimesTable(new List <int> {
         1, 3, 5
     }, 1, 10));
 }