program main
 implicit none
 integer N,tmp,i,j,k,ans
 integer, allocatable::p(:)
 read(*,*) N
 allocate(p(1:N))
 read(*,*) p
 
 ans = 1
 do i=2,N
  if(p(k) < p(k-1)) then
   ans = -1
   exit
  end if
 end do
 if(ans == -1) then   
  do i=1,N
   tmp = p(i)
   do j=1,N
    if(j == i) continue
    p(i) = p(j)
    p(j) = tmp
    ans = 1
    do k=2,N
     if(p(k) < p(k-1)) then
      ans = -1
      exit
     end if
    end do
    p(j) = p(i)
    p(i) = tmp
    if(ans == 1) exit
   end do
   if(ans == 1) exit
  end do
 end if
 
 if(ans == -1) then
  write(*,*) 'NO'
 else
  write(*,*) 'YES'
 end if
end program main
; 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"

@_QFEp.0 = internal unnamed_addr global ptr null
@_QFEp.8 = internal unnamed_addr global i64 0
@_QQcl.0ce9d142ab3e8b729e3735e32b7549ac = linkonce constant [73 x i8] c"/home/ubuntu/Downloads/TheStack_IR/Collated/Fortran/Source_3650/source.f\00"
@_QQcl.594553 = linkonce constant [3 x i8] c"YES"
@_QQEnvironmentDefaults = local_unnamed_addr constant ptr null

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

define void @_QQmain() local_unnamed_addr {
  %1 = alloca { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, align 8
  %2 = alloca i32, align 4
  %3 = tail call ptr @_FortranAioBeginExternalListInput(i32 -1, ptr nonnull @_QQcl.0ce9d142ab3e8b729e3735e32b7549ac, i32 5)
  %4 = call i1 @_FortranAioInputInteger(ptr %3, ptr nonnull %2, i32 4)
  %5 = call i32 @_FortranAioEndIoStatement(ptr %3)
  %6 = load i32, ptr %2, align 4, !tbaa !3
  %7 = call i32 @llvm.smax.i32(i32 %6, i32 0)
  %8 = zext i32 %7 to i64
  %9 = shl nuw nsw i64 %8, 2
  %10 = call ptr @malloc(i64 %9)
  store ptr %10, ptr @_QFEp.0, align 8, !tbaa !7
  store i64 %8, ptr @_QFEp.8, align 8, !tbaa !7
  %11 = call ptr @_FortranAioBeginExternalListInput(i32 -1, ptr nonnull @_QQcl.0ce9d142ab3e8b729e3735e32b7549ac, i32 7)
  %.unpack = load ptr, ptr @_QFEp.0, align 8, !tbaa !7
  %.unpack297.unpack.unpack299 = load i64, ptr @_QFEp.8, align 8, !tbaa !7
  store ptr %.unpack, ptr %1, align 8, !tbaa !7
  %.fca.1.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 1
  store i64 4, ptr %.fca.1.gep, align 8, !tbaa !7
  %.fca.2.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 2
  store i32 20180515, ptr %.fca.2.gep, align 8, !tbaa !7
  %.fca.3.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 3
  store i8 1, ptr %.fca.3.gep, align 4, !tbaa !7
  %.fca.4.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 4
  store i8 9, ptr %.fca.4.gep, align 1, !tbaa !7
  %.fca.5.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 5
  store i8 0, ptr %.fca.5.gep, align 2, !tbaa !7
  %.fca.6.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 6
  store i8 0, ptr %.fca.6.gep, align 1, !tbaa !7
  %.fca.7.0.0.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 7, i64 0, i64 0
  store i64 1, ptr %.fca.7.0.0.gep, align 8, !tbaa !7
  %.fca.7.0.1.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 7, i64 0, i64 1
  store i64 %.unpack297.unpack.unpack299, ptr %.fca.7.0.1.gep, align 8, !tbaa !7
  %.fca.7.0.2.gep = getelementptr inbounds { ptr, i64, i32, i8, i8, i8, i8, [1 x [3 x i64]] }, ptr %1, i64 0, i32 7, i64 0, i64 2
  store i64 4, ptr %.fca.7.0.2.gep, align 8, !tbaa !7
  %12 = call i1 @_FortranAioInputDescriptor(ptr %11, ptr nonnull %1)
  %13 = call i32 @_FortranAioEndIoStatement(ptr %11)
  %14 = call ptr @_FortranAioBeginExternalListOutput(i32 -1, ptr nonnull @_QQcl.0ce9d142ab3e8b729e3735e32b7549ac, i32 41)
  %15 = call i1 @_FortranAioOutputAscii(ptr %14, ptr nonnull @_QQcl.594553, i64 3)
  %16 = call i32 @_FortranAioEndIoStatement(ptr %14)
  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 i1 @_FortranAioInputDescriptor(ptr, ptr) local_unnamed_addr

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

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

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" }
attributes #1 = { 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"}
!7 = !{!8, !8, i64 0}
!8 = !{!"descriptor member", !5, i64 0}
