Please describe in one sentence what this code does. Assume that $a0 and $a1 are used for input and both initially contain the integers a and b, respectively. Assume that $v0 is used for the output. Also, convert this MIPS code to C & add comments to the code.

Add $t0, $zero, $zero

loop: beq $a1, $zero, finish

add $t0, $t0, $a0

sub $a1, $a1, 1

j loop

finish; addj $t0, $t0, 100

add $v0, $t0, $zero