How can I write pseudocode for the following diagram?

Question

I failed to use the do-while or while loop for the following diagram:

Here, A, B, and C are functions. How can I write pseudocode for the diagram above?

EDIT: This is from my programming practice of C++. Without the "B loop" (or the "A loop"), I am able to write it as the following:

Start
Input x;
while(x!=2)
{
A(); Input x;
}
C();
End

However, when the "B loop" comes in, I have no idea how to include it.

Answer 1

Start;

Input x;

while(x!=2){ 

    if (x!=1){
        A();
    } else{ 
        B()
    }
    Input x;
}

C();

End

But beware of the langage you are using I advise you to add a sleep mode between data aquisitions (Just before Input x)