In the following stack declaration, what is the stack size after stack operations?

stack $=[]$ # Array stack implementation

stack.append$(12)$ # Push on top of stack

stack.append$(2)$ # Push on top of stack

$y=$ stack.pop$()$

stack.append$(34)$ # Push on top of stack

$z=$ stack.pop$()$

stack.append$(11)$

# Push on top of stack

$[$ Select $]$

$3$

$2$

$1$