It's that time of the year again: WINTER! It has just snowed and Derek's driveway is covered in snow. It's Derek's job to shovel the snow but he hates doing it because it delays him from programming. Given , , , and , help Derek calculate how much time is needed to clear his driveway so he can get back to coding the next big game.
, the length of his driveway in metres
, the width of his driveway in metres
, the depth of the snow in metres
, the time (seconds) it takes to shovel 1 cubic metre
There will be a 4 lines of input, , , , and .
Output one number, rounded to exactly one decimal point, the number of seconds it takes for Derek to clear his driveway
3 4 0.5 20
The dimensions of the snow on his driveway is . It takes Derek 20 seconds per , so it takes him 120 seconds.