#include <cstdio>

using namespace std;

int n, m;
int aib[100100];

int gasirePutere(int x)
{
    return ((x ^ (x - 1)) & x);
}

void citire()
{
    scanf("%d %d", &n, &m);

    int tmp;

    for(int i = 1; i <= n; i++)
    {
        scanf("%d", &tmp);

        int nr = i;

        while(nr <= n)
        {
            aib[nr] += tmp;
            nr += gasirePutere(nr);
        }
    }
}

int sum(int x, int y)
{
    int suma = 0;
    int nr = y;

    while(nr >= 1)
    {
        suma += aib[nr];
        nr -= gasirePutere(nr);
    }

    nr = x - 1;

    while(nr >= 1)
    {
        suma -= aib[nr];
        nr -= gasirePutere(nr);
    }

    return suma;
}

int gasireSuma(int sumaCautata)
{
    int sumaPartiala;
    int x, y, m;

    x = 1;
    y = n;

    while(x < y)
    {
        m = (x + y) / 2;

        sumaPartiala = sum(1, m);

        if(sumaPartiala == sumaCautata)
        {
            return m;
        }
        else if(sumaPartiala > sumaCautata)
        {
            y = m - 1;
        }
        else
        {
            x = m + 1;
        }
    }

    return -1;
}

int main()
{
    freopen("aib.in", "r", stdin);
    freopen("aib.out", "w", stdout);

    citire();

    for(int k = 0; k < m; k++)
    {
        int tmp1, tmp2, tmp3;
        scanf("%d", &tmp1);

        if(tmp1 == 0)
        {
            scanf("%d %d", &tmp2, &tmp3);

            int nr = tmp2;

            while(nr <= n)
            {
                aib[nr] += tmp3;
                nr += gasirePutere(nr);
            }
        }
        else if(tmp1 == 1)
        {
            scanf("%d %d", &tmp2, &tmp3);

            printf("%d\n", sum(tmp2, tmp3));
        }
        else if(tmp1 == 2)
        {
            scanf("%d", &tmp2);

            printf("%d\n", gasireSuma(tmp2));
        }
    }

    return 0;
}