#include <fstream>

using namespace std;

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

int n, m;
int a[100010];


long long querry( int p )
{
    long long sum = 0;
    for(int q = p; q >= 1; q -= (q^(q-1)) & q )
        sum += a[q];
    return sum;
}

void update ( int p, int x)
{
    for(int q = p; q<=n; q += (q^(q-1)) & q )
        a[q] += x;
}

int main()
{
    int x;
    cin>>n>>m;
    for(int i=1; i<=n; ++i)
    {
        cin>>x;
        update(i, x);
    }

    int a, b, c, st, dr, mij;
    for(int i=1; i<=m; ++i)
    {
        cin>>c;
        if(c == 0)
        {
            cin>>a>>b;
            update(a, b);
        }
        else if(c == 1)
        {
            cin>>a>>b;
            cout<<querry(b) - querry(a-1)<<'\n';
        }
        else
        {
            cin>>a;

            st=1; dr=n;
            while(st<=dr)
            {
                mij = (st+dr)/2;
                if(querry(mij) >= a)
                    dr = mij-1;
                else
                    st = mij+1;
            }
            if(querry(st) == a)
                cout<<st<<'\n';
            else
                cout<<"-1\n";
        }
    }

    return 0;
}