#include <fstream>

using namespace std;
ifstream cin("aib.in");
ofstream cout("aib.out");

#define NMAX 100005
#define zeros(x) ((x^(x-1))&x)

int AIB[NMAX],N,M;

void Add(int x,int val)
{
    for(int i=x; i<=N; i+=zeros(i))
        AIB[i]+=val;
}

int Get(int x)
{
    int res=0;
    for(int i=x; i>0; i-=zeros(i))
        res+=AIB[i];
    return res;
}

int Search(int x)
{
    int st=1,dr=N,mid,val,sol=-1;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        val=Get(mid);
        if(val==x)
        {
            sol=mid;
            dr=mid-1;
        }
        else if(val<x)
            st=mid+1;
        else dr=mid-1;
    }
    return sol;
}

int main()
{
    int i,op,a,b,x;
    cin>>N>>M;
    for(i=1; i<=N; i++)
    {
        cin>>x;
        Add(i,x);
    }
    for(i=1; i<=M; i++)
    {
        cin>>op;
        if(op==0)
        {
            cin>>a>>b;
            Add(a,b);
        }
        else if(op==1)
        {
            cin>>a>>b;
            cout<<Get(b)-Get(a-1)<<'\n';
        }
        else
        {
            cin>>a;
            cout<<Search(a)<<'\n';
        }
    }
    return 0;
}