# include <cstdio>
# define LSB(x) ((-x) & x)
# define nmax 100001
using namespace std;
int n,m,p,v,p1,p2,s,aib[nmax],x;
inline void update(int val,int poz)
{
    int i;
    for(i=poz; i<=n; i+=LSB(i))
        aib[i]+=val;
}
inline int sum(int poz)
{
    int i,S=0;
    for(i=poz; i>0; i-=LSB(i))
        S+=aib[i];
    return S;
}
inline int caut_bin(int val)
{
    int i=1,j=n,m,x;
    while(i<=j)
    {
        m=(i+j)>>1;
        x=sum(m);
        if(x==val)return m;
        else if(x>val)j=m-1;
        else i=m+1;
    }
    return -1;
}
int main()
{
    int i;
    freopen("aib.in","r",stdin);
    freopen("aib.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1; i<=n; ++i)
    {
        scanf("%d",&x);
        update(x,i);
    }
    for(i=1; i<=m; ++i)
    {
        scanf("%d",&x);
        switch(x)
        {
        case 0:
            scanf("%d%d",&p,&v);
            update(v,p);
            break;
        case 1:
            scanf("%d%d",&p1,&p2);
            printf("%d\n",sum(p2)-sum(p1-1));
            break;
        case 2:
            scanf("%d",&s);
            printf("%d\n",caut_bin(s));
            break;
        }
    }
    return 0;
}