#include <bits/stdc++.h>
#define lsb(x) (-x)&x
using namespace std;
ifstream in("aib.in");
ofstream out("aib.out");
vector < int > aib;
int n,q,x,op,a,b;
void adauga (int poz, int val)
{
    for(int i=poz; i<=n; i+=lsb(i))
        aib[i]+=val;
}
int suma (int poz)
{
    int s=0;
    for(int i=poz; i>0; i-=lsb(i))
        s+=aib[i];
    return s;
}
int caut_bin (int s)
{
    int st=1;
    int dr=n;
    int mij;
    int poz=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(aib[mij]==s)
        {
            poz=mij;
            dr=mij-1;
        }
        else if(aib[mij]>s)
            dr=mij-1;
        else
            st=mij+1;
    }
    return poz;
}
int main()
{
    in>>n>>q;
    aib=vector < int > (n+1,0);
    for(int i=1; i<=n; i++)
    {
        in>>x;
        adauga(i,x);
    }
    for(;q;q--)
    {
        in>>op;
        if(op==0)
        {
            in>>a>>b;
            adauga(a,b);
        }
        else if(op==1)
        {
            in>>a>>b;
            out<<suma(b)-suma(a-1)<<'\n';
        }
        else if(op==2)
        {
            in>>a;
            out<<caut_bin(a)<<'\n';
        }
    }
    return 0;
}