#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");
int sync();
int aib[100005],n,m;
void adaugare(int a,int b)
{
    for(int i=a; i<=n; i+=(i&(-i)))
        aib[i]+=b;
}
int suma(int a,int b)
{   int sum1=0,sum2=0;
        for(int i=b;i>0; i-=(i&(-i)))
            sum1+=aib[i];
        for(int i=a-1;i>0; i-=(i&(-i)))
            sum2+=aib[i];
    return sum1-sum2;
}
void cauta(int a)
{
    int s=1,d=min(a,n);
    while (s<=d)
    {
        int m=(s+d)/2;
        int x=suma(1,m);
        if (a<x)
        {
            d=m-1;
        }
        if (a>x)
        {
            s=m+1;
        }
        if (a==x)
        {
            fout<<m;
            return;
        }
    }
    fout<< -1;
    return;
}
void interogare()
{
    fin>>n>>m;
    int x,a,b;
    for(int i=1; i<=n; i++)
        fin>>x,adaugare(i,x);
    for(int i=1; i<=m; i++)
    {
        fin>>x;
        if(x==0)
        {
            fin>>a>>b;
            adaugare(a,b);
        }
        else if(x==1)
        {
            fin>>a>>b;
            fout<<suma(a,b);
        }
        else
        {
            fin>>a;
            cauta(a);
        }
        if(x!=0)
            fout<<endl;
    }
}
int main()
{
    interogare();
    return 0;
}