#include <fstream>
using namespace std;
ifstream cin("aib.in");
ofstream cout("aib.out");
const int N=100000;
int n,aib[N+5];
int m,tip,a,b;
int f(int x){
    return x&(-x);
}
void add(int poz,int val){
    for(int i=poz;i<=n;i+=f(i))
        aib[i]+=val;
}
int prefix(int poz){
    int sol=0;
    for(int i=poz;i>=1;i-=f(i))
        sol+=aib[i];
    return sol;
}
int main(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        int a;
        cin>>a;
        add(i,a);
    }
    for(int i=1;i<=m;i++){
        cin>>tip;
        if(tip==0){
            cin>>a>>b;
            add(a,b);
        }
        if(tip==1){
            cin>>a>>b;
            cout<<prefix(b)-prefix(a-1)<<"\n";
        }
        if(tip==2){
            cin>>a;
            int r=0,pas=(1<<17);
            while(pas){
                if(r+pas<n && prefix(r+pas)<a)
                    r+=pas;
                pas/=2;
            }
            r++;
            if(prefix(r)==a)
                cout<<r<<"\n";
            else
                cout<<"-1\n";
        }
    }
    return 0;
}