Hi ranklein,
I'll try to answer your question, however my altimetry is a bit rusty!
Terrain clearance = 1500'
Height of mountain above 995mb level = 4730m = 15514' (using 1m = 3.28')
Difference between 1013mb level and 995 mb level = 18mb * 27' = 486'
Therefore height of aircraft above 1013mb level = 486'+15514'+1500' = 17500' or FL175.
However, according to Instrument Flight Rules, flying on a heading of 140(M) means we have to fly an ODD flight level. Therefore the minimum flight level required is FL190.
P.S. In the UK outside controlled airspace and below FL245 we fly quadrantal flight levels. In this case on a heading of 140(M) we would fly an ODD + 500' flight level and so the minimum flight level would be FL175.