Consider the following code fragment:

namespace a {
  namespace b {
    int f(int x, int y=1) { return x + y; }
  }
  int f(int x) { return x > 1 ? x + 1 : a::b::f(x - 1); }
}
int g(int x) {
  return x % 3 == 0 ? a::b::f(x, 3) : a::f(x);
}

What is the value returned by g(x) for when x equals 1, 2, and 3 respectively?