What is the output of the following C program?

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int f(int x, int *py, int **ppz)
{ 
  int y, z; 
  **ppz += 1;  
   z  = **ppz; 
  *py += 2; 
   y = *py;
   x += 3;
   return x + y + z;
}
  
void main()
{
   int c, *b, **a;
   c = 4; 
   b = &c;
   a = &b;  
   printf( "%d", f(c,b,a));
   getchar();
}