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#include <bits/stdc++.h>
#define Nmx 100005
using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int v[Nmx],A[Nmx];
int n,m,poz,start,stop;
void build(int l,int r,int nod)
{
if(l==r)
A[nod]=v[l];
else
{
int m=(l+r)/2;
build(l,m,2*nod);
build(m+1,r,2*nod+1);
A[nod]=A[2*nod]+A[2*nod+1];
}
}
void update(int poz,int val)
{
while(poz<=n)
{
A[poz]+=val;
poz+=(poz&(-poz));
}
}
int query(int poz)
{
int sum=0;
while(poz>0)
{
sum+=A[poz];
poz-=(poz&(-poz));
}
return sum;
}
int cauta_bin(int k)
{
int l=1,r=n,m,val;
while(l<=r)
{
m=(l+r)/2;
val=query(m);
if(val==k)return m;
if(val<k)l=m+1;
else
r=m-1;
}
return -1;
}
int main()
{
int i,x,y;
int t;
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>x;
update(i,x);
}
for(i=1;i<=m;i++)
{
f>>t;
if(t==0)
{
f>>x>>y;
update(x,y);
}
else
if(t==1)
{
f>>x>>y;
g<<query(y)-query(x-1)<<"\n";
}
else
{
f>>x;
g<<cauta_bin(x)<<"\n";
}
}
return 0;
}