#include <iostream>
#include <string>

using namespace std;

int main(int argc, char* argv[])
{
    string line;
    int cycle = 1;
    int accumulator = 1;
    int answer = 0;
    while(getline(cin, line))
    {
        int next_adden = 0;
        if (line.substr(0,4).compare("addx") == 0)
        {
            next_adden = stoi(line.substr(5));
            cycle++;
            if ((cycle-20)%40 == 0)
            {
                answer += cycle*accumulator;
            }
            accumulator += next_adden;
        }

        cycle++;
        if ((cycle-20)%40 == 0)
        {
            answer += cycle*accumulator;
        }
    }
    cout << answer << endl;
}