function [X, f1] = DeJong6(Xi) 
n = 1;
f1 = 0;
V = 4189.829101;
X = 0;
a = abs(X);
LL = -500;              %Lower limit
UL = 500;               %Upper limit
X = LL +rand(1,n)*(UL-LL);% step1 Choose starting design X, 
for n=1:1:10
    f1=(-X*sin(a.^0.5))+f1;
end
f= 10*V+f1
%f1 = 10*V+sum(-X*sin(a.^0.5))
end