LetExp([
 FunctionDec[
  (printint,[
   (i,true,int)],
   NONE,
   LetExp([
    FunctionDec[
     (f,[
      (i,true,int)],
      NONE,
      IfExp(
       OpExp(GtOp,
        VarExp(
         SimpleVar(i)),
        IntExp(0)),
       SeqExp[
        CallExp(f,[
         OpExp(DivideOp,
          VarExp(
           SimpleVar(i)),
          IntExp(10))]),
        CallExp(print,[
         CallExp(chr,[
          OpExp(PlusOp,
           OpExp(MinusOp,
            VarExp(
             SimpleVar(i)),
            OpExp(TimesOp,
             OpExp(DivideOp,
              VarExp(
               SimpleVar(i)),
              IntExp(10)),
             IntExp(10))),
           CallExp(ord,[
            StringExp("0")]))])])]))]],
    IfExp(
     OpExp(LtOp,
      VarExp(
       SimpleVar(i)),
      IntExp(0)),
     SeqExp[
      CallExp(print,[
       StringExp("-")]),
      CallExp(f,[
       OpExp(MinusOp,
        IntExp(0),
        VarExp(
         SimpleVar(i)))])],
     IfExp(
      OpExp(GtOp,
       VarExp(
        SimpleVar(i)),
       IntExp(0)),
      CallExp(f,[
       VarExp(
        SimpleVar(i))]),
      CallExp(print,[
       StringExp("0")])))))]],
 LetExp([
  VarDec(rate,true,NONE,
   IntExp(2)),
  FunctionDec[
   (getCost,[
    (total,true,int)],
    SOME(int),
    LetExp([
     VarDec(newrate,true,NONE,
      IntExp(10)),
     FunctionDec[
      (getExtra,[],
       NONE,
       IfExp(
        OpExp(GtOp,
         VarExp(
          SimpleVar(total)),
         IntExp(100)),
        AssignExp(
         SimpleVar(rate),
         IntExp(5)),
        AssignExp(
         SimpleVar(rate),
         VarExp(
          SimpleVar(rate)))))]],
     SeqExp[
      CallExp(getExtra,[]),
      OpExp(TimesOp,
       OpExp(TimesOp,
        VarExp(
         SimpleVar(newrate)),
        VarExp(
         SimpleVar(total))),
       VarExp(
        SimpleVar(rate)))]))]],
  CallExp(printint,[
   OpExp(PlusOp,
    CallExp(getCost,[
     IntExp(250)]),
    IntExp(20))])))