A long Stairway

A ball rolls horizontally off the top of a stairway with a speed of $141.6773 ms^{-1}$ . The steps are $20.3 cm$ high and $20.3 cm$ wide. Which step does the ball hit first? Take $g=9.8 ms^{-2}$

If your answer is $N$ , then enter the value as $\frac{N}{10}$ .