Should Builder calculate parameter values

Let's say I have following class and a builder for it:

public class A(){
    private B b;
    private C c;

    private A(Builder builder) {
       this.b = builder.b;
       this.c = bulder.c;
    }

    public static class Builder() {
       private B b;
       private C c;

       public Builder setB(B b){
           this.b = b;
           return this;
       }

       public Builder setC(C c){
           this.C = c;
           return this;
       }

       public A build(){
          return new A(this);
       }
    }
}

Now let's say that b and c need to be calculated somehow (for example, based on list of D). May question is:

Where to put filling parameters b and c based on some calculation, that is, should I place calculation in A, in builder, or somewhere else?