记录编号	238070	评测结果	AAAAA
题目名称	[长郡中学2004] 0/1字符串问题	最终得分	100
用户昵称	Hzoi_	是否通过	通过
代码语言	C++	运行时间	0.000 s
提交时间	2016-03-18 16:50:39	内存使用	0.29 MiB

#include<cstdio>
using namespace std;
int a[]={0,2,4,6,10,16,24,36,56,80,118,174,254,378,554,802,1168,1716,2502,3650,5324,7754,11320,16502,24054,35058,51144,74540,108664,158372,230800,336480,490458,714856,1041910,1518840,2213868,3226896,4703372,6855388,9992596};
int n;
int main(){
	freopen("str01.in","r",stdin);
	freopen("str01.out","w",stdout);
	scanf("%d",&n);
	printf("%d",a[n]);
	return 0;
}