#include <iostream>
#include <fstream>
#define u(x) ((x ^ (x - 1)) & x)

using namespace std;

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

int aib[100005], v[100005];
int n, k, op;

void Update(int poz, int x)
{
    for (int i = poz; i <= n; i += u(i))
        aib[i] += x;
}

int Query(int poz)
{
    int sum = 0;
    for (int i = poz; i > 0; i = i - u(i))
        sum += aib[i];
    return sum;
}

int CautareBinara(int a[], int n, int nr)
{
    int st = 1, dr = n;
    while (st <= dr)
    {
        int mij = (st + dr) / 2;
        int x = Query(mij);
        if (x == nr)
            return mij;
        else
        {
            if (x > nr)
                dr = mij - 1;
            else if (x < nr)
                st = mij + 1;
        }
    }
    return -1;
}

int main()
{
    int i;
    int poz, x, y, nr;
    fin >> n >> k;
    for (i = 1; i <= n; ++i)
    {
        fin >> v[i];
        Update(i, v[i]);
    }

    for (i = 1; i <= k; ++i)
    {
        fin >> op;
        if (op == 0)
        {
            fin >> poz >> x;
            Update(poz, x);
        }
        else if (op == 1)
        {
            fin >> x >> y;
            fout << Query(y) - Query(x - 1) << "\n";
        }
        else if (op == 2)
        {
            fin >> nr;
            fout << CautareBinara(aib, n, nr) << "\n";
        }
    }
    return 0;
}