#include <cctype>
#include <iostream>
#include <string>
#include <vector>


class StringParser {
public:
    void ProcessSymbol(char symbol) {
        if (symbol == '[') {
            repeats_ *= current_number_;
            stack_.push_back(current_number_);
            current_number_ = 0;
        } else if (symbol == ']') {
            repeats_ /= stack_.back();
            stack_.pop_back();
        } else if (std::isdigit(symbol)) {
            current_number_ *= 10;
            current_number_ += symbol - '0';
        } else {
            length_ += repeats_;
        }
    }

    int64_t GetLength() const {
        return length_;
    }

private:
    std::vector<int64_t> stack_;
    int64_t current_number_ = 0, length_ = 0, repeats_ = 1;
};

int main() {
    std::string string;
    std::cin >> string;
    StringParser parser;
    for (auto symbol : string) {
        parser.ProcessSymbol(symbol);
    }
    std::cout << parser.GetLength() << "\n";
}