function S=func27(x)
% x0 = [0, 0]
% xo = [0.7411, 0.7411]
% S(xo) = -17.96

 v1=20*x(1);
 v2=20*x(2);
 S=-sin(v1/pi).^2 .* sin(v2/pi).^2 .* (abs(v1)+abs(v2)+0.1*(v1+v2))+(v1.*v1+v2.*v2)/30;

% 
%   [xo,Ot,nS]=swarm('test27',[0 0],0,[1 1],[-1 -1],[1 1],[],100,20)
%