#include <iostream>
#include <string>

using namespace std;

bool read_positive() {
    char top = ' ', bot;
    cin >> top >> bot;
    return top == '+';
}

int main() {

    int flips_needed = 0;
    bool last_positive = read_positive();

    string line;
    getline(cin, line);

    for (int i = 2; i < line.size(); i += 2) {
        if (line[i] != line[i-2] && line[i] == '-')
            flips_needed++;
    }

    std::cout << flips_needed << std::endl;
    return 0;
}