#include <iostream>
using namespace std;

#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define scan(x) cin >> x
#define print(x) cout << x << "\n"

int main() {
    fastcin;
    int n; scan(n);
    char s[n]; scan(s);
    int no = 1;
    rep(i, 1, n) {
        if (s[i]=='-') no--;
        else if (s[i]=='x') no++;
    }
    if (no < 1) no = 1;
    print(no);
    return 0;
}