#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, x = 0;
  string s;
  cin >> n;
  for (int i = 0; i < n; ++i) {
    cin >> s;
    if (s == "X++" || s == "++X")
      x++;
    else
      x--;
  }
  cout << x;
}
