#include <bits/stdc++.h>

using namespace std;

int n, aib[100005];
ifstream fin("aib.in");
ofstream fout("aib.out");

void Update(int p, int x)
{
    while(p <= n)
    {
        aib[p] += x;
        p += (p & (-p));
    }
}


///sum a[1..p]
int Suma(int p)
{
    int s = 0;
    while(p > 0)
    {
        s += aib[p];
        p -= (p & (-p));
    }
    return s;
}

///cauta cea mai din stanga pozitie poz cu sum a[1]+..a[poz] = s
int CautBin(int p, int s)
{
    int st, dr, poz, mij;
    int sum;
    st = 1; dr= p; poz = -1;
    while(st <= dr)
    {
        mij = (st + dr)/2;
        sum = Suma(mij);
        if (sum == s)
        {
            poz = mij;
            dr = mij -1;
        }
        else if (sum > s) dr = mij -1;
        else st = mij + 1;
    }
    return poz;
}
int main()
{
    int i, m, op, a, b, x;
    fin >> n >> m;
    for (i = 1; i <= n; i++)
    {
        fin >> x;
        Update(i, x);
    }
    while(m--)
    {
        fin >> op ;
        if(op == 0)
        {
          fin >> a >> b;
          Update(a, b);
        }
        else if (op == 1){
            fin >> a >> b;
            fout << (Suma(b) - Suma(a-1)) << "\n";
        }
        else {
                fin >> a;
                fout<<CautBin(n, a) << "\n";
        }
    }
    fin.close();
    fout.close();
    return 0;
}