#include <bits/stdc++.h>
using namespace std;
int i, n, value, p, val, a, b, st, dr, mij, poz, m;
long long aib[100005];
int LastBit(int x)
{
    return x & (- x);
}
void update(int index, int value)
{
    for(int i = index; i <= n; i = i + LastBit(i))
        aib[i] = aib[i] + value;
}
int query(int value)
{
    int s = 0;
    for(int i = value; i > 0; i = i - LastBit(i))
        s = s + aib[i];
    return s;
}
int main()
{
    ifstream f("aib.in");
    ofstream g("aib.out");
    f >> n >> m;
    for(i = 1; i <= n; i ++)
    {
        f >> value;
        update(i, value);
    }
    for(i = 1; i <= m; i ++)
    {
        f >> p;
        if(p == 0)
        {
            f >> a >> b;
            update(a, b);
        }
        if(p == 1)
        {
            f >> a >> b;
            g << query(b) - query(a - 1) << "\n";
        }
        if(p == 2)
        {
            f >> value;
            poz = 0;
            st = 1;
            dr = n;
            while(st <= dr)
            {
                mij = (st + dr) / 2;
                val = query(mij);
                if(val == value)st = dr + 1, poz = mij;
                else if(val < value)st = mij + 1;
                else dr = mij - 1;
            }
            if(poz == 0)g << "-1" << "\n";
            else g << poz << "\n";
        }
    }
    return 0;
}