#include<bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops,inline")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define setinf(x) memset(x,0x3f3f3f3f,sizeof(x));
#define set0(x) memset(x,0,sizeof(x));
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define INF 0x3f3f3f3f
#define vi vector<int>
#define ll long long
#define vll vector<ll>
#define pb push_back
#define fi first
#define se second
#define DD 100001
#define nl '\n'
using namespace std;
const string file="aib";
ifstream f(file+".in");
ofstream g(file+".out");
//#define f cin
//#define g cout
struct aib {
    int n;
    vi v;
    aib(int _n) {
        n=_n;
        v.resize(n+1,0);
    }
    void update(int poz, int val) {
        for (int i=poz; i<=n; i+=i&-i)
            v[i]+=val;
    }
    int query(int poz) {
        int s=0;
        for (int i=poz; i>0; i-=i&-i)
            s+=v[i];
        return s;
    }
    int query(int st, int dr) {
        return query(dr)-query(st-1);
    }
};
int main(){
    int n,m;
    f>>n>>m;
    aib a(n);
    for (int i=1; i<=n; ++i) {
        int x;
        f>>x;
        a.update(i,x);
    }
    while (m--) {
        int t;
        f>>t;
        if (t==0) {
            int x,y;
            f>>x>>y;
            a.update(x,y);
        }
        else if (t==1) {
            int x,y;
            f>>x>>y;
            g<<a.query(x,y)<<"\n";
        }
        else {
            int x;
            f>>x;
            int st=1,dr=n,poz=0;
            while (st<=dr) {
                int mid=(st+dr)>>1;
                if (a.query(mid)==x) {
                    poz=mid;
                    break;
                }
                if (a.query(mid)>x) {
                    dr=mid-1;
                }
                else st=mid+1;
            }
            g<<(poz?poz:-1)<<nl;
        }
    }
    system("pause");
    return 0;
}