Hypothesis Tests · Hard problem

A coin is tossed $400$ times to test $H_0$: $p = 0.5$ against $H_a$: $p \ne 0.5$ at $\alpha = 0.05$ ($z^* = 1.96$), using the $z$ statistic for $\hat p$. What is the smallest number of heads ABOVE $200$ that leads to rejecting $H_0$?