#include <fstream>
using namespace std;

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

int aib[100005], n, m, t, a, b;

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

int query(int poz) {
    int sum = 0;
    for(int i = poz; i; i -= (i&(-i)))
        sum += aib[i];
    return sum;
}

int cb(int a) {
    int st = 1, dr = n;
    while(st <= dr) {
        int mij = (st+dr)/2;
        int q = query(mij);
        if(q == a && query(mij-1) < a) return mij;
        else if(q >= a) dr = mij-1;
        else st = mij+1;
    }
    return -1;
}


void citire() {
    fin >> n >> m;
    for(int i = 1; i <= n; i++) {
        int x;
        fin >> x;
        update(i, x);
    }
}

void solve() {
    while(m--) {
        fin >> t;
        if(t == 0) {
            fin >> a >> b;
            update(a, b);
        } else if(t == 1) {
            fin >> a >> b;
            fout << query(b)-query(a-1) << '\n';
        } else {
            fin >> a;
            fout << cb(a) << '\n';
        }
    }
}

int main() {
    citire();
    solve();
}