#include <iostream>
#include <cstdio>
//#include <bits/stdc++.h>

using namespace std;

long long a[2000000];
int n;
void set(int i, long long x, int v, int l, int r) {
    if (r - l == 1) {
        a[v] = x;
        return;
    }
    int m = (l + r) / 2;
    if (i <= m) {
        set(i, x, 2 * v + 1, l, m);
    }
    else {
        set(i, x, 2 * v + 2, m, r);
    }
    a[v] = a[2 * v  + 1] + a[2 * v + 2];
}

long long sum(int L, int R, long long v, int l, int r) {
    if (R <= l || r <= L) {
        return 0L;
    }
    if (l >= L && r <= R) {
        //cout << a[v] << " ";
        return a[v];
    }
    int m = (l + r) / 2;
    long long sl = sum(L, R, 2 * v + 1, l, m);
    long long sr = sum(L, R, 2 * v + 2, m, r);
    return sl + sr;
}

int main() {
    cin >> n;
    int b = 1;
    while (n > b) {
        b *= 2;
    }
    long long k = 0;
    for (int i = 0; i < n; i++) {
        cin >> k;
        //cin >> a[b - 1 + i];
        set(i + 1, k, 0, 0, b);
    }
    /*cout << sum(0, b, 0, 0, b) << endl;
    for (int i = 0; i < 2 * b - 1; i++) {
        cout << a[i] << " ";
    }*/
    string str;
    while (cin >> str) {
        //cout << str << endl;
        if (str[1] == 'u') {
            int x, y;
            cin >> x >> y;
            //cout << x << " " << y << endl;
            cout << sum(x, y + 1, 0, 1, b + 1) << endl;
        }
        if (str[1] == 'e') {
            int x;
            long long y;
            cin >> x >> y;
           // cout << x << " " << y << endl;
            set(x, y, 0, 0, b);
            /*for (int i = 0; i < 2 * b - 1; i++) {
                cout << a[i] << " ";
            }*/
        }
    }
    return 0;
}