#include <fstream>

using namespace std;

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

int arb[100005];

int n, m;
int x;
int op, a, b;


void add(int idx, int val)
{
    while(idx <= n){
        arb[idx] += val;
        idx += idx & -idx;
    }
}

int sum(int idx)
{
    int s = 0;
    while(idx){
        s += arb[idx];
        idx -= idx & -idx;
    }
    return s;
}

int k_thTerm(int val)
{
    int left = 1;
    int right = n;
    int mid = -1;
    while(right - left > 1){
        mid = (left+right)/2;
        sum(mid) < val ? left = mid: right = mid;
    }
    return sum(left) == val ? left : sum(right) == val ? right : -1;
}

int main()
{

    in >> n >> m;
    for(int i=1; i<=n; i++){
        in >> x;
        add(i, x);
    }

    for(int i=0; i<m; i++){
        in >> op;
        if(op == 2){
            in >> a;
            out << k_thTerm(a) << '\n';
        }else{
            in >> a >> b;
            if(op == 0){
                add(a, b);
            }else{
                out << sum(b) - sum(a-1) << '\n';
            }
        }
    }

    return 0;
}