function S=test(x)
% x0 = 10*ones(n,1)
% xo = zeros(n,1)
% S(xo) = 0
 n=length(x);
 S=-20*exp(-0.2*sqrt(sum(x.^2)/n))-exp(sum(cos(2*pi*x))/n)+20+exp(1);

%   n=length(x0);
%   [xo,Ot,nS]=swarm('test34',10*ones(n,1),0,ones(n,1),-32.68*ones(n,1),32.68*ones(n,1),[],100,20)
%