The special shadow-complexity of ${\mathrm{\#}}_k(S^1\times S^3)$

The special shadow-complexity is an invariant of closed $4$-manifolds defined by Costantino using Turaev’s shadows. We show that for any positive integer $k$, the special shadow-complexity of the connected sum of $k$ copies of $S^1\times S^3$ is exactly $k+1$.