#include <iostream>
#include <fstream>
using namespace std;
#define zeros(x) ((x^(x-1))&x)
ifstream fin("aib.in");
ofstream fout("aib.out");
int abi[100],n,m,x,t;
void adauga(int ind,int val)
{
    for(int i=ind; i<=n; i+=zeros(i))
        abi[i]+=val;
}
int sum(int st,int dr)
{
    int sa=0,sb=0;
    for(int i=st-1; i>0; i-=zeros(i))
        sa=sa+abi[i];
    for(int i=dr; i>0; i-=zeros(i))
        sb=sb+abi[i];
    return sb-sa;
}
int cauta(int val)
{
    for(int i=1; i<=n; i=i<<1)
        if(val==abi[i])
            return i;
    return -1;
}
int main()
{
    fin>>n>>m;
    int i,ind,val,st,dr;
    for(i=1; i<=n; i++)
    {
        fin>>x;
        adauga(i,x);
    }

    for(i=1; i<=m; i++)
    {
        fin>>t;
        if(t==0)
        {
            fin>>ind>>val;
            adauga(ind,val);
        }
        else if(t==1)
        {
            fin>>st>>dr;
            fout<<sum(st,dr)<<'\n';
        }
        else if(t==2)
        {
            fin>>val;
            fout<<cauta(val)<<'\n';
        }

    }
    return 0;
}