Add comments to each line of the following mips code and describe in a sentence or two what it computes. assume that $a0 is used for the input and initially contains n, a positive integer. assume that $v0 is used for returning the output value. begin: addi $t0, $zero, 0 addi $t1, $zero, 1 loop: slt $t2, $a0, $t1 bne $t2, $zero, finish add $t0, $t0, $t1 addi $t1, $t1, 2 j loop finish: add $v0, $t0, $zero