#include <bits/stdc++.h>

using namespace std;

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

const int NMAX = 100005;

int n, m;
int op, a, b;
int v[NMAX], aib[NMAX];

int get_sum(int i) {
    int sum = 0;
    while (i) {
        sum += aib[i];
        i -= i & -i;
    }
    return sum;
}

void update(int i, int val) {
    while (i <= n) {
        aib[i] += val;
        i += i & -i;
    }
}

void create_aib() {
    ///aib initializat initial cu 0
    ///O(n*log(n))
    for (int i = 1; i <= n; i++)
        update(i, v[i]);
}

//void make_aib() {
//    ///O(n)
//
//}

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

    create_aib();

    while(m--) {
        fin >> op;
        if (op == 0) {
            fin >> a >> b;
            v[a] += b;
            update(a, b);
        }
        else if (op == 1) {
            fin >> a >> b;
            fout << get_sum(b) - get_sum(a-1) << '\n';
        }
        else {
            fin >> a;
            int k = 1, ok = 0;
            while (k <= n && !ok) {
                int sum = get_sum(k);
                if (sum == a) {
                    ok = 1;
                }
                k++;
            }
            k--;
            if (ok)
                fout << k << '\n';
            else
                fout << -1 << '\n';
        }
    }

    return 0;
}