1 #define IOS ios_base::sync_with_stdio(0); cin.tie(0);
2 #include <cstdio>//sprintf islower isupper
3 #include <cstdlib>//malloc exit strcat itoa system("cls")
4 #include <iostream>//pair
5 #include <fstream>//freopen("C:\\Users\\13606\\Desktop\\草稿.txt","r",stdin);
6 #include <bitset>
7 //#include <map>
8 //#include<unordered_map>
9 #include <vector>
10 #include <stack>
11 #include <set>
12 #include <string.h>//strstr substr
13 #include <string>
14 #include <time.h>//srand(((unsigned)time(NULL))); Seed n=rand()%10 - 0~9;
15 #include <cmath>
16 #include <deque>
17 #include <queue>//priority_queue<int, vector<int>, greater<int> > q;//less
18 #include <vector>//emplace_back
19 //#include <math.h>
20 //#include <windows.h>//reverse(a,a+len);// ~ ! ~ ! floor
21 #include <algorithm>//sort + unique : sz=unique(b+1,b+n+1)-(b+1);+nth_element(first, nth, last, compare)
22 using namespace std;//next_permutation(a+1,a+1+n);//prev_permutation
23 //******************
24 int abss(int a);
25 int lowbit(int n);
26 int Del_bit_1(int n);
27 int maxx(int a,int b);
28 int minn(int a,int b);
29 double fabss(double a);
30 void swapp(int &a,int &b);
31 clock_t __STRAT,__END;
32 double __TOTALTIME;
33 void _MS(){__STRAT=clock();}
34 void _ME(){__END=clock();__TOTALTIME=(double)(__END-__STRAT)/CLOCKS_PER_SEC;cout<<"Time: "<<__TOTALTIME<<" s"<<endl;}
35 //***********************
36 #define rint register int
37 #define fo(a,b,c) for(rint a=b;a<=c;++a)
38 #define fr(a,b,c) for(rint a=b;a>=c;--a)
39 #define mem(a,b) memset(a,b,sizeof(a))
40 #define pr printf
41 #define sc scanf
42 #define ls rt<<1
43 #define rs rt<<1|1
44 typedef long long ll;
45 const double E=2.718281828;
46 const double PI=acos(-1.0);
47 //const ll INF=(1LL<<60);
48 const int inf=(1<<30);
49 const double ESP=1e-9;
50 const int mod=(int)1e9+7;
51 const int N=(int)1e2+10;
52
53 int dp[N][N];
54 char s[N];
55
56 int main()
57 {
58 while(sc("%s",s+1)&&s[1]!='e')
59 {
60 int l=strlen(s+1);
61 mem(dp,0);
62 for(int len=2;len<=l;++len)
63 {
64 for(int i=1;i<=l-len+1;++i)
65 {
66 if(s[i]=='('&&s[i+len-1]==')'||s[i]=='['&&s[i+len-1]==']')
67 dp[i][i+len-1]=dp[i+1][i+len-2]+2;
68 for(int j=i;j<=i+len-1;++j)
69 dp[i][i+len-1]=max(dp[i][i+len-1],dp[i][j]+dp[j+1][i+len-1]);
70 }
71 }
72 pr("%d\n",dp[1][l]);
73 }
74 return 0;
75 }
76
77 /**************************************************************************************/
78
79 int maxx(int a,int b)
80 {
81 return a>b?a:b;
82 }
83
84 void swapp(int &a,int &b)
85 {
86 a^=b^=a^=b;
87 }
88
89 int lowbit(int n)
90 {
91 return n&(-n);
92 }
93
94 int Del_bit_1(int n)
95 {
96 return n&(n-1);
97 }
98
99 int abss(int a)
100 {
101 return a>0?a:-a;
102 }
103
104 double fabss(double a)
105 {
106 return a>0?a:-a;
107 }
108
109 int minn(int a,int b)
110 {
111 return a<b?a:b;
112 }
