uses
crt;
var
a:array[1..1000] of integer;
b,c,n,i,k:integer;
begin
writeln('wvedite n');
readln(n);
writeln('wvedite posledovatelno ',n,' chisel');
for i:= 1 to n do
read(a[i]);
writeln('wvedite promeshutok a b');
readln(b,c);
if ((b>n) or (b<0) or (c>n) or (c<0)) then writeln('ERROR')
else begin
k:=0;
for i:= b + 1 to c - 1 do
k:=k+1;
writeln('kolvo chisel na otrezke ',b,' ',c,' ','ravna ',k);
end;
readkey
end.