#include<bits/stdc++.h>
#define int long long
#define i128 __int128
using namespace std;
#define fi first
#define sc second
#define pii pair<int,int>
#define pb push_back
const int maxn=1e5+10;
int n,num;
i128 p,a[maxn];
void solve(){
	cin>>n>>num,p=num;
	for(int i=1;i<=n;i++) cin>>num,a[i]=num;
	i128 sum=0;
	for(int i=1;i<=n;i++){
		if(sum+(a[i-1]*(i128)i)>=p) return cout<<i-1<<endl,void();
		sum+=a[i];
	}
	cout<<n<<endl;
}
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    int t=1;
//    cin>>t;
    while(t--) solve();
    return 0;
}
/*
Samples
input:

output:

THINGS TODO:
检查freopen，尤其是后缀名
检查空间
检查调试语句是否全部注释
*/