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

int main() {
    std::string string;
    std::cin >> string;
    std::vector<int64_t> stack;
    int64_t current_number = 0, length = 0, repeats = 1;
    for (auto symbol : string) {
        if (std::isdigit(symbol)) {
            current_number *= 10;
            current_number += symbol - '0';
        } else if (symbol == '[') {
            repeats *= current_number;
            stack.push_back(current_number);
            current_number = 0;
        } else if (symbol == ']') {
            repeats /= stack.back();
            stack.pop_back();
        } else {
            length += repeats;
        }
    }
    std::cout << length << "\n";
}