#include <iostream>
#include <string>

using namespace std;

int main()
{
    int n, x = 0;
    cin >> n;
    while (n--)
    {
        string s;
        cin >> s;
        if (s.find("++") != -1)
        {
            x++;
        }
        if (s.find("--") != -1)
        {
            x--;
        }
    }
    cout << x << endl;
    return 0;
}