program A326A
    implicit none
    integer(8)::N,ans,i,calc
    character(100)::S
    read*,N,S
    ans=0
    calc=0
    do i=1,N
        if(S(i:i)=="I")calc=calc+1
        if(S(i:i)=="D")calc=calc-1
        ans=max(ans,calc)
    end do

    print'(i0)',ans
end program A326A
; ModuleID = 'FIRModule'
source_filename = "FIRModule"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

@_QFEs = internal global [100 x i8] undef
@_QQcl.3edc65be83007a8077d816abd1eb7ae5 = linkonce constant [73 x i8] c"/home/ubuntu/Downloads/TheStack_IR/Collated/Fortran/Source_7552/source.f\00"
@_QQcl.49 = linkonce constant [1 x i8] c"I"
@_QQcl.44 = linkonce constant [1 x i8] c"D"
@_QQcl.28693029 = linkonce constant [4 x i8] c"(i0)"
@_QQEnvironmentDefaults = local_unnamed_addr constant ptr null

define void @_QQmain() local_unnamed_addr {
  %1 = alloca i64, align 8
  %2 = tail call ptr @_FortranAioBeginExternalListInput(i32 -1, ptr nonnull @_QQcl.3edc65be83007a8077d816abd1eb7ae5, i32 5)
  %3 = call i1 @_FortranAioInputInteger(ptr %2, ptr nonnull %1, i32 8)
  %4 = call i1 @_FortranAioInputAscii(ptr %2, ptr nonnull @_QFEs, i64 100)
  %5 = call i32 @_FortranAioEndIoStatement(ptr %2)
  %6 = load i64, ptr %1, align 8, !tbaa !3
  %7 = icmp sgt i64 %6, 0
  br i1 %7, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %8 = phi i64 [ %18, %.lr.ph ], [ 1, %0 ]
  %.011 = phi i64 [ %.2, %.lr.ph ], [ 0, %0 ]
  %.0810 = phi i64 [ %17, %.lr.ph ], [ 0, %0 ]
  %9 = add nsw i64 %8, -1
  %10 = getelementptr [100 x [1 x i8]], ptr @_QFEs, i64 0, i64 %9
  %11 = call i32 @_FortranACharacterCompareScalar1(ptr %10, ptr nonnull @_QQcl.49, i64 1, i64 1)
  %12 = icmp eq i32 %11, 0
  %13 = zext i1 %12 to i64
  %spec.select = add i64 %.011, %13
  %14 = call i32 @_FortranACharacterCompareScalar1(ptr %10, ptr nonnull @_QQcl.44, i64 1, i64 1)
  %15 = icmp eq i32 %14, 0
  %16 = sext i1 %15 to i64
  %.2 = add i64 %spec.select, %16
  %17 = call i64 @llvm.smax.i64(i64 %.0810, i64 %.2)
  %18 = add nuw i64 %8, 1
  %exitcond.not = icmp eq i64 %8, %6
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.08.lcssa = phi i64 [ 0, %0 ], [ %17, %.lr.ph ]
  %19 = call ptr @_FortranAioBeginExternalFormattedOutput(ptr nonnull @_QQcl.28693029, i64 4, ptr null, i32 -1, ptr nonnull @_QQcl.3edc65be83007a8077d816abd1eb7ae5, i32 14)
  %20 = call i1 @_FortranAioOutputInteger64(ptr %19, i64 %.08.lcssa)
  %21 = call i32 @_FortranAioEndIoStatement(ptr %19)
  ret void
}

declare ptr @_FortranAioBeginExternalListInput(i32, ptr, i32) local_unnamed_addr

declare i1 @_FortranAioInputInteger(ptr, ptr, i32) local_unnamed_addr

declare i1 @_FortranAioInputAscii(ptr, ptr, i64) local_unnamed_addr

declare i32 @_FortranAioEndIoStatement(ptr) local_unnamed_addr

declare i32 @_FortranACharacterCompareScalar1(ptr, ptr, i64, i64) local_unnamed_addr

declare ptr @_FortranAioBeginExternalFormattedOutput(ptr, i64, ptr, i32, ptr, i32) local_unnamed_addr

declare i1 @_FortranAioOutputInteger64(ptr, i64) local_unnamed_addr

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.smax.i64(i64, i64) #0

attributes #0 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!llvm.module.flags = !{!0, !1, !2}

!0 = !{i32 2, !"Debug Info Version", i32 3}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{!4, !4, i64 0}
!4 = !{!"any data access", !5, i64 0}
!5 = !{!"any access", !6, i64 0}
!6 = !{!"Flang Type TBAA Root"}
