1 #include <iostream>
 2 using namespace std;
 3 
 4 bool judge(char c[256]){
 5     int top=0;
 6     int i=0;
 7     while(c[i]!=‘@‘){
 8         if(c[i]==‘(‘) top++;
 9         if(c[i]==‘)‘){
10             if(top>0) top--;
11             else return false;
12         }
13         i++;//忘记这一句 
14     }
15     if(top!=0) return false;
16     else return true;
17     
18 }
19 
20 int main(){
21     char c[256];
22     scanf("%s",c);
23     cout<<judge(c)<<endl;
24     return 0;
25 }