Math/Programming Puzzle: Use of functions

This little *puzzle* I made are for those C/C++ programmers who are good with math and such. In the following source code, I will make a bunch of functions that will take a constant numeric variable and perform mathematical operations with that constant variable. Now, the purpose of the puzzle is for **you** programmers to use those functions to reach a certain number. You could use the function as many times as you'd like.

Here is an example:

const variable= 9;

goal to reach= 63;

Code:

`#include <iostream>`

using std::cout;

int a( int );

int b( int );

int main( int argc, char *argv[] )

{

const int cNum= 9;

int tempNum;

tempNum= a( cNum );

tempNum= b( cNum ) + a( tempNum );

cout << tempNum;

cin.get();

return 0;

}

int a( int Number )

{

return( Number * 2 );

}

int b( int Number )

{

return( Number * 3 );

}

I hope you understand the concept. I will post the first *mission* next.