#include <bits/stdc++.h>

using namespace std;

const int mxn = 1e5+5;

typedef long long ll;
typedef __int128_t int128;

int main(){
    ios_base::sync_with_stdio(0), cin.tie(nullptr);

    int n; cin >> n;

    ll MX; cin >> MX;
    ll mx = MX;

    double sum = 0;

    vector<ll> arr(n);
    for(ll &i: arr) cin >> i;

    for(int i = 0; i < n; i++){
        double x = i+1;
        ll CC; CC = arr[i];
        x *= CC;
        x += sum;

        if(x >= mx){
            cout << i << endl;
            return 0;
        }

        sum += CC;
    } 

    cout << n << endl;
    

    return 0;
}