In this correctly worked addition, \(P\), \(Q\), \(R\) and \(S\) represent different digits, and all seven digits are different.

\[ \begin{array}{cccc} &5&P&+\\ &Q&R&\\\hline S&4&3\end{array} %speech%, 5 P plus Q R equals S 43\]

What is the sum of \(P\), \(Q\), \(R\) and \(S\)?