What is Size Of Calculate Function?

#include <iostream.h> 
  #include <conio.h> 
    int x=2; 
    int* calculate(int,int); 
    void main() 
     { 
                 int *p,a=0,b=5; 
                 clrscr(); 
                 p=calculate (a,b); 
                 cout<<"Sum of a+x+b : "<<*p; 
                 getch(); 
     } 
         int * calculate(int a, int b) 
     { 
          static int z; 
          z=a+x+b; 
          return &z; 
     }