If $$\frac{p}{a} + \frac{q}{b} + \frac{r}{c} = 1$$ and $$\frac{a}{p} + \frac{b}{q} + \frac{c}{r} = 0$$ where a, b, c, p, q, r are non-zero real numbers, then $$\frac{{{p^2}}}{{{a^2}}} + \frac{{{q^2}}}{{{b^2}}} + \frac{{{r^2}}}{{{c^2}}}$$ is equal to = ?