Compute a position size. Balance: <B> <account currency>. Risk per trade: <r> per cent of balance. Instrument: <symbol>. Entry: <price>. Stop-loss: <price>. Pip value per 1 lot for this symbol in my account currency, taken from the terminal: <value>. Minimum volume and volume step: <min>, <step>.

Return: stop distance in pips; money at risk; volume in lots rounded DOWN to the step; the arithmetic line by line. If any input is missing, stop and ask. Do not assume a pip value. Do not comment on whether the trade is a good idea.
