main:	addi	$sp, $sp, -4
	sw	$ra, 0($sp)
	
	li	$a0,48
	jal	sqrt
	
	lw	$ra, 0($sp)
	addi	$sp, $sp, 4
	jr	$ra

sqrt:	addi	$v0, $zero, 0	# r := 0
loop:	mul	$t0, $v0, $v0	# $t0 := r*r
	bgt	$t0, $a0, end	# if (r*r > n) goto end
	addi	$v0, $v0, 1	# r := r + 1
	j	loop		# goto loop
end:	addi	$v0, $v0, -1	# r := r - 1
	jr	$ra		# return with r-1 in $v0