function L=Lagranz()
tablica;
n=length(X);
L=zeros(1,n);
for i=1:n
    p=1;
    for j=1:n
        if i~=j
            p=conv(p,[1 -X(j)])/(X(i)-X(j));
        end
    end
    L=L+p*F(i);
end