$(10$ points$)$ Assume $$s0=5$ before the following MIPS assembly program is executed. What is the value of $$t1$ after the program ends?

addi $$to,$ $zero, $1$

addi $$t1,$ $zero, $1$

$sw$ $$t0,0($$$s1)$

addi $$s0,$$$s0,-1$

beq $$so,$ $zero, End

addi $$s1,$ $$s1,4$

$sw$ $$t1,0($$$s1)$

addi $$t2,$$$t0,1$

addi $$t0,$$$t1,0$

add $$t1,$$$t2,$$$t1$

addi $$s0,$$$s0,-1$

$j$ Loop

End: