Input the program on page $258$ on the MARIE simulator environment. Observe the changes of the different registers $($Addr$,$ Next, Num, Sum, Ctr$)$

$\backslash$table$[[$EXAMPLE $4\mathrm{.}2$ Here is an example using a loop to add five numbers:$],[$Hex Address Instruction first$],[100,$Load,,$/$Load address of first number to be added$],[101,$Store,Nex,$],[102,$Load,Num,Load thent$],[103,$Subt,One,$/$ Store this value in Ctr to control$],[104,$Store,,$/$Load the Sum into AC$],[105,$Loop, Load,$\backslash$table$[[$Sum$],[$Next$]],/$Add the value pointed to by location Noxt$],[106,$AddI,Sum,$/$Store this sum$],[108,$Load,Next,$/$ Load Next$],[109,$Add,One,$/$ Increment by one to point to next addre$],[10$ A$,$Store,Next,$/$Store in our pointer Next$],[10B,$Load,Ctr$,/$Load the loop control variable$],[10$ C$,$Subt,One,$/$ Subtract one from the loop control variable$],[10D,$Store,Ctr$,/$Store this new value in loop control variable$],[10E,$Skipcond,$000,\backslash$table$[[/$If control variable skip next$],[/$instruction$]]],[10F,$Jump,Loop,$/$Otherwise$,$ go to Loop$],[110,$Halt,,$/$Terminate program$],[111,$Addr, Hex,$117,/$ Numbers to be summed start at location$],[112,$Next, Hex,$0,/$A pointer to the next number to add$],[113,$Num, Dec,$5,/$ The number of values to add$],[114,$Sum, Dec,$0,/$The sum$],[115,$Ctr$,$ Hex,$0,/$The loop control variable$],[116,$One, Dec,$1,/$Used to increment and decrement by$],[117,$Dec,$10,/$The values to be added together$],[118,$Dec,$15,],[119,$Dec,$20,],[11A,$Dec,$25,],[11$B$,$Dec,$30,]]$