We are given a multi-set of numbers which consist of "$x$" 1's, "$y$" 2's and "$z$" 3's. 

Given x,y and z , how to figure how out if this set can be divided into 2 equal parts(where sum of both the sets is equal to each other) ?

Example:-
x=1;
y=1;
z=1;
Set is:-{1,2,3}
And 2-parts:-->{1,2},{3}