A

#define _CRT_SECURE_NO_WARNINGS
#define debug(l) cerr<<#l<<' '<<l<<'\n';
#include "bits/stdc++.h"
using namespace std;
#define all(a) a.begin(), a.end()
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
struct Fenwick {
    vector<ll> t;
    Fenwick(ll n) {
        t.resize(n+1);
    }
    ll get(ll i) {
        ll sum = 0;
        for (ll k = i; k > 0; k -= k & -k) {
            sum += t[k];
        }
        return sum;
    }
    ll sum(ll l,ll r) {
        return get(r) - get(l - 1);
    }
    void upd(ll i, ll x) {
        for (ll k = i; k < (ll)t.size(); k += k & -k) {
            t[k] += x;
        }
    }
};
signed main() {
#ifdef _DEBUG
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    ll n, m; cin >> n >> m;
    Fenwick F(n);
    while (m--) {
        char in; cin >> in;
        if (in == 'A') {
            ll ind, x;
            cin >> ind >> x;
            ll last_sum = F.sum(ind, ind);
            x -= last_sum;
            F.upd(ind, x);
        }
        else {
            ll l, r;
            cin >> l >> r;
            cout << F.sum(l, r) << '\n';
        }
    }
}