REM  *****  BASIC  *****
REM  Provided was a excel file with a bunch
REM  of numbers in the cells A2 to A82 and
REM  a ton of formulas in the cells B2 to E82
REM  
REM  cells  B1 to E4 were setup to have a random number.
REM  in between 1 and 256
REM
REM  and there was a frormula in cell G2 
REM  that provided the check for the input.
REM  =IF(AND(E82=1,B1>1,B1<=256,C1>1,C1<=256,D1>1,D1<=256,E1>1,E1<=256,B1-C1=46,E1-D1=119),"Congrats! Here is yout flag: INSA{"&TEXT(B1,"0")&"-"&TEXT(C1,"0")&"-"&TEXT(D1,"0")&"-"&TEXT(E1,"0")&"}","Wrong input")
REM  ===============================================
REM  
REM  
REM  I took a look at the formula in the cell G2
REM  and a quick peak at some in the range[A2:E82]
REM  and i realized that what was going on in the
REM  cells in the range [A2:E82] was somthing
REM  I did't not wish to spend my time on.
REM  =IF(MID($A2,4,1)=TEXT(COLUMN()-1,"0"),IF(MID($A2,1,1)="1",MOD(SUM(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="2",MOD(SUM(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),-INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="3",MOD(PRODUCT(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="4",MOD(MOD(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="5",MOD(BITAND(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="6",MOD(BITOR(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1))),INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1)))),256),IF(MID($A2,1,1)="7",IF(INDIRECT(ADDRESS(ROW()-1,1+MID($A2,2,1)))=INDIRECT(ADDRESS(ROW()-1,1+MID($A2,3,1))),1,0),"X"))))))),B1)REM  
REM  ===============================================
REM  so i focust on cell G2
REM  
REM  INTERESTING STUFF FROM CELL G2:
REM  +-------------------
REM  | E82=1 <---- the value of E82 the result of
REM  |              a ton of formulas in the cells
REM  | B1>1,     \                       [A2:E82]
REM  | B1<=256,   | 
REM  | C1>1,      | 
REM  | C1<=256,    \ so all the input has to 
REM  | D1>1,       / be in between 1 and 256 
REM  | D1<=256,   |
REM  | E1>1,      |  and there are some more
REM  | E1<=256,  /    restraints down there.
REM  |
REM  | B1-C1=46,   <---1B = 1C+46
REM  | E1-D1=119), <--- 1E = 1D+119 
REM  +---------------------------------------
REM  with all these restraints we are well within a accepable 
REM  Range to brute force the correct input.
REM  So within a couple of minutes i whiped up a python script.
REM  that printed out all posible inputs within the restraints.
REM  
REM  the only problem we have now is how are we going to provide
REM  this to the spreadsheet. I can not just pipe it to libre office.
REM
REM  So i decided to readup a little bit on excel macros (or libre-office macros)
REM  and the basic language.
REM  
REM  And came up with this scipt. :-)
Sub Main
End Sub
REM  I was to lazy to lookup how to access a cells text.
REM  so i added a cell the formula =IF(G2="Wrong input",1,0) to cell M3
REM                             ( you know, hackers will hack)
Sub BruteForceTheFlag
sjiet = ThisComponent.sheets.getByName("Feuil1")
B = sjiet.getCellRangeByName("B1")
C = sjiet.getCellRangeByName("C1")
D = sjiet.getCellRangeByName("D1")
E = sjiet.getCellRangeByName("E1")
flag = sjeit.getCellRangeByName("M3")



C.value = 1 
B.value = C.value +46
D.value = 1
E.value = D.value+119

Do
    C.value = C.value +1
    B.value = C.value +46
    DO
        D.value = D.value+1
        E.value = D.value+119
        
    Loop Until D.value > 256 OR E.value > 256 OR flag.value = 0
    if E.value > 256 then
        D.value = 1
        E.value = D.value+119
    endif
Loop Until flag.value = 0  OR B.value > 256
End Sub
REM found two flags.
REM INSA{75-29-13-132}
REM INSA{203-157-13-132}    <--- this one was the valid one. 
REM                              it was pointed out in the challenge
REM                              decription that the were two valid inputs. 
REM                              and that the correct flag was the one was the one with the highes sum.
REM                              ..
REM                              wich was nice of them to point this out..
REM                              unlike what happends some time when there are 
REM                              over 60.000 valid inputs, and all you get is a
REM                              md5sum of the valid one in exchage for 20 point.
REM                              Not pointing any finger here.  *cough* uutCTF.*cough**cough*