Can anyone help me in solving the code coach

Question

It's the first code coach of C++ that is "transportation"
The question is input should be 126 and output should be 24
But after I have written the and then it shows that there are five test cases of which 3 are hidden and the two of them shows another input and output.
https://code.sololearn.com/c5j2oqixkV0Y/?ref=app

Answer 1

https://www.sololearn.com/Discuss/2615622/?ref=app