program panasonic2020B
    implicit none
    integer(8)::H,W
    read*,H,W
    if(H==1.or.W==1)then
        print'(i0)',1
    else
        print'(i0)',(H*W)/2+mod(H*W,2)
    end if
end program panasonic2020B
; 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"

@_QQcl.0d837ec210bef8f578d9048c7488bcb3 = linkonce constant [73 x i8] c"/home/ubuntu/Downloads/TheStack_IR/Collated/Fortran/Source_2100/source.f\00"
@_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 = alloca i64, align 8
  %3 = tail call ptr @_FortranAioBeginExternalListInput(i32 -1, ptr nonnull @_QQcl.0d837ec210bef8f578d9048c7488bcb3, i32 4)
  %4 = call i1 @_FortranAioInputInteger(ptr %3, ptr nonnull %1, i32 8)
  %5 = call i1 @_FortranAioInputInteger(ptr %3, ptr nonnull %2, i32 8)
  %6 = call i32 @_FortranAioEndIoStatement(ptr %3)
  %7 = load i64, ptr %1, align 8, !tbaa !3
  %8 = icmp eq i64 %7, 1
  %9 = load i64, ptr %2, align 8, !tbaa !3
  %10 = icmp eq i64 %9, 1
  %11 = or i1 %8, %10
  br i1 %11, label %12, label %15

12:                                               ; preds = %0
  %13 = call ptr @_FortranAioBeginExternalFormattedOutput(ptr nonnull @_QQcl.28693029, i64 4, ptr null, i32 -1, ptr nonnull @_QQcl.0d837ec210bef8f578d9048c7488bcb3, i32 6)
  %14 = call i1 @_FortranAioOutputInteger32(ptr %13, i32 1)
  br label %24

15:                                               ; preds = %0
  %16 = call ptr @_FortranAioBeginExternalFormattedOutput(ptr nonnull @_QQcl.28693029, i64 4, ptr null, i32 -1, ptr nonnull @_QQcl.0d837ec210bef8f578d9048c7488bcb3, i32 8)
  %17 = load i64, ptr %1, align 8, !tbaa !3
  %18 = load i64, ptr %2, align 8, !tbaa !3
  %19 = mul i64 %18, %17
  %20 = sdiv i64 %19, 2
  %21 = srem i64 %19, 2
  %22 = add nsw i64 %20, %21
  %23 = call i1 @_FortranAioOutputInteger64(ptr %16, i64 %22)
  br label %24

24:                                               ; preds = %12, %15
  %.sink = phi ptr [ %13, %12 ], [ %16, %15 ]
  %25 = call i32 @_FortranAioEndIoStatement(ptr %.sink)
  ret void
}

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

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

declare i32 @_FortranAioEndIoStatement(ptr) local_unnamed_addr

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

declare i1 @_FortranAioOutputInteger32(ptr, i32) local_unnamed_addr

declare i1 @_FortranAioOutputInteger64(ptr, i64) local_unnamed_addr

!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"}
