Number of paramagnetic oxides among the following given oxides is __________.
$\mathrm{Li}_2 \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_2 \mathrm{O}_2, \mathrm{KO}_2, \mathrm{MgO}$ and $\mathrm{K}_2 \mathrm{O}$
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