Need some help !!! :)

Ok, i m new in C++ so i have 1 problem

i have this code in c++ and i have to figure why i have 8 as a result

Code:

#include <iostream>
using namespace std;

int* f(int* a){
   int b = 2;
   (*a) += b;
   return a;
}
int main (){
   int a = 5;
   (*f(&a))++;
   cout << a << endl; 
   return 0;
}

thank you .