记录编号	1584	评测结果	WWTTTTTTTA
题目名称	圆弦	最终得分	10
用户昵称	NickName	是否通过	未通过
代码语言	Pascal	运行时间	7.002 s
提交时间	2008-09-05 14:31:57	内存使用	0.00 MiB

program circlex;
var x1,x2:longint;
xiaoyi,shizhu:text;
n:longint;
ls,jg:longint;
function go(a:longint):longint;
var x:longint;
begin
if (a=1) or (a=0) then
go:=1 else
begin
ls:=0;
for x:=1 to a do
ls:=ls+go(x-2)*go(a-x);
go:=ls;
end;
end;
begin
assign(xiaoyi,'circlex.in');
assign(shizhu,'circlex.out');
reset(xiaoyi);
rewrite(shizhu);
readln(xiaoyi,n);
close(xiaoyi);
jg:=go(n);
writeln(shizhu,jg);
close(shizhu);
end.