#include <bits/stdc++.h>
#define zeros(x) ((x^(x-1))&x)
#define DM 100005
using namespace std;
ifstream fin("aib.in");
ofstream fout("aib.out");

int n,m,AIB[DM],a,b,aux;

int getIntv(int dr){
    int ans=0;
    for(int i=dr;i;i-=zeros(i))
        ans+=AIB[i];
    return ans;
}

void update(int ind,int val){
    for(int i=ind;i<=n;i+=zeros(i))
        AIB[i]+=val;
}

int cautBin(int sum){
    int st=1,dr=n,mid;
    while(st<=dr){
        mid=(st+dr)/2;
        if(getIntv(mid)==sum)
            return mid;
        if(getIntv(mid)<sum) st=mid;
        else dr=mid;
    }
}

int main()
{
    fin>>n>>m;
    for(int i=1;i<=n;++i){
        fin>>aux;
        update(i,aux);
    }
    while(m--){
        fin>>aux;
        if(!aux){
            fin>>a>>b;
            update(a,b);
        }
        if(aux==1){
            fin>>a>>b;
            fout<<getIntv(b)-getIntv(a-1)<<'\n';
        }
        if(aux==2){
            fin>>a;
            fout<<cautBin(a)<<'\n';
        }
    }
    return 0;
}