#include <bits/stdc++.h>
#define INFILE "aib.in"
#define OUTFILE "aib.out"
#define DIM 100005
#define zeroes(i) (i & -i)

using namespace std;

ifstream f(INFILE);
ofstream g(OUTFILE);

int n, m, aib[DIM];

void update(int val, int poz) {
    for (int i = poz; i <= n; i += zeroes(i))
        aib[i] += val;
}

int query(int poz) {
    int sum = 0;
    for (int i = poz; i >= 1; i -= zeroes(i))
        sum += aib[i];

    return sum;
}

int cb(int val) {
    int st = 1, dr = n, poz = -1;
    while (st <= dr) {
        int mid = (st + dr) / 2;
        int acutalValue = query(mid);

        if (query(mid) > val) {
            dr = mid - 1;
        } else if (query(mid) == val) {
            dr = mid - 1;
            poz = mid;
        } else {
            st = mid + 1;
        }
    }

    return poz;
}

int main() {

    f >> n >> m;

    for (int i = 1; i <= n; i++) {
        int val;
        f >> val;
        update(val, i);
    }

    for (int i = 1; i <= m; i++) {
        int ops;
        f >> ops;

        if (ops == 0) {
            int a, b;
            f >> a >> b;
            update(b, a);
        } else if (ops == 1) {
            int a, b;
            f >> a >> b;
            g << query(b) - query(a - 1) << "\n";
        } else {
            int val;
            f >> val;
            g << cb(val) << "\n";
        }
    }

    return 0;
}