# we need to change to use the stack

	.text
main:

	li	$v0, 4					
	la	$a0, main_msg1
	syscall						#printf("calling function f\n");					
	
	li	$t0, 22
	move	$a0, $t0
	move	$t1, $ra
	jal	f
	move	$ra, $t1
	
	move	$t1, $v0

	li	$v0, 4					
	la	$a0, main_msg2
	syscall	

	li	$v0, 1
	move	$a0, $t1
	syscall

	li 	$v0, 11
	li 	$a0, '\n'
	syscall	

	li	$v0, 0					#return 0
	jr	$ra

f:
	move 	$t0, $a0
	li	$v0, 4					
	la	$a0, f_msg1
	syscall	

	li	$v0, 1
	move 	$a0, $t0
	syscall

	li	$v0, 11
	la	$a0, '\n'
	syscall

	mul	$t2, $t0, 2
	move	$v0, $t2
	jr	$ra


	.data
main_msg1:
	.asciiz "calling function f\n"
main_msg2:
	.asciiz "back from function f\n"
f_msg1:
	.asciiz "in function f\n"