#include <iostream>
#include <string>
#include <stack>
#include <algorithm>
using namespace std;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int res=0,x=1;
string s;
cin >> s;
stack<char> sta;
for(int i=0; s[i]; i++) {
if(s[i]=='(') {
x*=2;
sta.push(s[i]);
} else if(s[i]=='[') {
x*=3;
sta.push(s[i]);
} else if (s[i]==')') {
if (sta.empty() || sta.top()!='(') {
res=0;
break;
}
else if(s[i-1]=='('){
res+=x;
x/=2;
sta.pop();
} else {
x/=2;
sta.pop();
}
} else if (s[i]==']') {
if (sta.empty() || sta.top()!='[') {
res=0;
break;
}
else if(s[i-1]=='['){
res+=x;
x/=3;
sta.pop();
} else {
x/=3;
sta.pop();
}
}
}
if(sta.empty()) cout << res;
else cout << 0;
}
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