function f=liaoch(x)
a=[1.25 8.75 0.5 5.75 3 7.25];
b=[1.25 0.75 4.75 5 6.5 7.75];
d=[3 5 4 7 6 11];
e=[20 20];
f1=0;

for  i=1:6
   s(i)=sqrt((x(13)-a(i))^2+(x(14)-b(i))^2);
   f1=s(i)*x(i)+f1;
end
f2=0;
for  i=7:12
   s(i)=sqrt((x(15)-a(i-6))^2+(x(16)-b(i-6))^2);
   f2=s(i)*x(i)+f2;
end

f=f1+f2;