<image>As shown in figure 1, it is a bicentric triangle, where we obtain S = ∠A₁ + ∠A₂ + … + ∠A₆ = 360°. In figure 2, it is a bicentric quadrilateral, where we obtain S = ∠A₁ + ∠A₂ + … + ∠A₇ = 720°. In figure 3, it is a bicentric pentagon, where we obtain S = 1080°, … Clever students, please write out directly according to the above pattern, in a bicentric n-sided polygon (n ≥ 3 as an integer), S = ___ degrees. (Express the final result with an algebraic expression involving n)
