uses crt;
const n=18;
var a:array[1..n] of integer;
i,j,p,k:byte;
x:integer;
begin
clrscr;
randomize;
writeln('Массив:');
for i:=1 to n do
begin
a[i]:=i;
write(a[i],' ');
end;
writeln;
writeln;
p:=n div 2;
i:=1;k:=1;
while k<=p do
begin
x:=a[n];
for j:=n downto i+2 do
a[j]:=a[j-1];
a[i+1]:=x;
i:=i+2;
k:=k+1;
end;
writeln('Перестановка элементов');
for i:=1 to n do
write(a[i],' ');
readln
end.