#include <fstream>
#define DIM 100001
using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");

int n,m,a,b,tip,A[DIM];
int main()
{
    f >> n >> m;
    for(int i=1; i<=n; i++) f >> A[i];

    for(int i=1; i<=m; i++)
    {
        f >> tip;
        if(tip == 0)
        {
            f >> a >> b;
            A[a]+=b;
        }
        else if(tip == 1)
        {
            f >> a >> b;
            int s = 0;
            for(int i=a; i<=b; i++) s+=A[i];
            g << s << '\n';
        }
        else
        {
            f >> a;
            int s = 0, ok = 0;
            for(int i=1; i<=n; i++)
            {
                s+=A[i];
                if(s == a) g << i << '\n', i=n, ok=1;
            }
            if(!ok) g << "-1\n";
        }
    }

    g.close();
    return 0;
}