What does this code do? Debugging required because the output calculated is incorrct. (For example: Input of two numbers, 2 and 0 gives the output of 2400) How does this happen?

ORG 100 Input a /first factor Store a /store the factor Input Ctr /second factor used to control loop Store Ctr /store second factor Load Ctr /reload second factor to assure it is not zero Skipcond 800 /check if the second factor is greater than zero Jump End /jump to end if the second factor is zero, product will be 0 Loop, Load Ctr /reload second factor Subt One /Subtract the factor by 1 through each loop iteration Store Ctr /Store second factor Load Sum /Load the sum of addition operation; initially zero Add a /add first factor to sum Store Sum /store sum Load Ctr /load second factor to check its state SKipcond 400 /stop the loop if the second factor is equal to zero Jump Loop /run the loop if the second factor is not equal to zero Load Sum /load sum for output End, Output /output final "product" Halt /terminate program

a, Dec 0 /first factor Ctr, Dec 0 /second factor Sum, Dec 0 /sum of repeated addition One, Dec 1 /used to decrement the second factor