Convert problem 70 to be all integer math.
Convert problem 70 to be all integer math.

I lose a fair chunk of time because I still stay within domains at all
times so I do a divide before I multiply instead of getting the
overflow if my numbers are large enough, but it still ends up ~50 ms
faster than the previous attempt and doesn't look as odd from using
doubles everywhere for integer math.

Tim-Tom/project-euler,Tim-Tom/project-euler,Tim-Tom/project-euler