文件目录

#include <iostream>
using namespace std;
int main()
{
    int n;
    string s;
    cin >> n >> s;
    int ans = 0;
    for (int i = 0; s[i]; i++)
    {
        if (s[i] <= 90)
            ans -= s[i];
        else
            ans += s[i] - 96;
    }
    cout << ans;
    return 0;
}