double the number in the mips

Question

The task is: "Modify the program shown in Figure 3-4. Ask the user to enter an integer value, then print the result of doubling that number. Use the add statement.", and this is the program I need to modify:

        .data
str1: .asciiz "Prosze podac liczb: \n"
str2: .asciiz "Wprowadzona liczba to:"
    
    .text
main:
    li $v0, 4
    la $a0, str1
    syscall
    li $v0, 5
    syscall 
    move $s0, $v0
    li $v0, 4
    la $a0, str2
    syscall
    li $v0, 1 
    move $a0, $s0
    syscall 
    li $v0, 10
    syscall