signed main() {
    seriy();
    int n, k;
    cin >> n >> k;
    int len = sqrt(n);
    vi a(n);
    vi b(n / len + 1);
    while(k--) {
        char c;
        cin >> c;
        int x, y;
        cin >> x >> y;
        if(c == 'A') {
            x--;
            int pos = x;
            int prev = a[pos];
            a[pos] = y;
            pos /= len;
            b[pos] -= prev;
            b[pos] += y;
        }
        else {
            x--;
            y--;
            int l = x;
            int r = y;
            int sum = 0;
            while(l <= r) {
                if(l % len == 0 && l + len - 1 <= r) {
                    sum += b[l / len];
                    l += len;
                }
                else {
                    sum += a[l];
                    l++;
                }
            }
            cout << sum << '\n';
        }
    }
    return 0;
}