// problema aib
// solutie de 100p

#include <iostream>
#include <fstream>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <stack>
#include <deque>

using namespace std;

#define NMax 100000

ifstream fin("aib.in");
ofstream fout("aib.out");

int n, m;
int v[NMax + 3], aib[NMax + 3];

void input() {
    fin >> n >> m;
    for (int i = 1; i <= n; ++i) fin >> v[i];
}

void init() {
    int p;
    for (int i = 1; i <= n; ++i) {
        aib[i] = v[i];
        p = i & (-i);
        for (int k = 1; k < p; k *= 2) aib[i] += aib[i - k];
    }
}

void add(int i, int v) {
    for (int k = i; k <= n; k += k & (-k)) aib[k] += v;
}

long long getsum(int i) {
    long long s = 0;
    for (int k = i; k; k -= k & (-k)) s += (long long)aib[k];
    return s;
}

void solve() {
    int c, a, b;
    for (int i = 1; i <= m; ++i) {
        fin >> c;
        if (c == 0) {
            fin >> a >> b;
            add(a, b);
        } else if (c == 1) {
            fin >> a >> b;
            fout << getsum(b) - getsum(a - 1) << '\n';
        } else {
            fin >> a;
            int st = 1, dr = n, k = (st + dr) / 2;
            for (long long s = getsum(k); s != a && st <= dr; s = getsum(k), k = (st + dr) / 2) {
                if (s < a) st = k + 1;
                else if (s > a) dr = k - 1;
            }
            while (getsum(k) < a) ++k;
            while (getsum(k) > a) --k;
            fout << k << '\n';
        }
    }
}

int main() {
    input();
    init();
    solve();
}