function out=knn(c1,c2,ob)

m1=size(c1);
l1=m1(2);

m2=size(c2);
l2=m2(2);

c1=c1-ob*ones(1,l1);
c2=c2-ob*ones(1,l2);

s1=sum(c1.*c1);
s2=sum(c2.*c2);

if (min(s1)>=min(s2))
    out=2;
else
    out=1;
end