uses crt;
var a:array[1..100]of integer;
n,i,kt:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
kt:=0;
for i:=1 to n do
if a[i]<>a[n+1-i] then kt:=1;
if kt=0 then writeln('Day la mang doi xung')
else writeln('Day khong la mang doi xung');
readln;
end.