program let;
uses crt;
var
n, x: integer;
begin
clrscr;
writeln('сколько вам лет?');
readln(x);
case x of
1:
writeln('год');
2, 3, 4:
writeln('года');
5 .. 20, 30, 40, 50, 60, 70, 80, 90, 99:
writeln('лет');
end;
end.