#include <fstream>

using namespace std;

int BIT[100010];

ifstream f("aib.in");
ofstream g("aib.out");

int getSum(int index)
{
    int sum = 0;
    index = index + 1;
    while(index)
    {
        sum += BIT[index];
        index -= index &(-index);
    }
    return sum;
}

void update(int index, int val, int n)
{
    index = index + 1;
    while(index <= n)
    {
        BIT[index] += val;
        index += index & (-index);
    }
}

int main()
{
    int n, i, m, val, c, a, b, ok, j;
    f >> n >> m;
    for(i = 0; i < n; i++)
    {
        f >> val;
        update(i, val, n);
    }
    for(i = 0 ; i < m; i++)
    {
        f >> c;
        if(c == 0)
        {
            f >> a >> b;
            update(a-1, b, n);
        }
        if(c == 1)
        {
            f >> a >> b;
            g << (getSum(b-1) - getSum(a-2)) << '\n';
        }
        if(c == 2)
        {
            f >> a;
            ok = 0;
            for(j = 0; j < n; j++)
            {
                val = getSum(j);
                if(val == a)
                {
                    g << j+1 << '\n';
                    ok = 1;
                    break;
                }
            }
            if(ok == 0)
                g << -1 << '\n';
        }
    }
}