The task here is to complete the main method inside the class SumOfTriangles. The method should read ints from the user, compute their "triangle" $($see below$)$ and add the "triangles" together until any negative number is entered. The method should then print out the sum of the triangles of all the non$-$negative integers entered $($followed by a newline$).$ If there are no non$-$negative integers before the first negative integer, the result should be $0.$

The triangle of a positive integer nn is n$($n$+1)22$n$($n$+1).$ Note that the numerator is always even, so you can safely do integer division.