#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define int ll
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
using pii = pair<int, int>;
using vi = vector<int>;
#define fi first
#define se second
#define pb push_back

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);

    int n,p;
    cin>>n>>p;
    __int128 sum=0;
    int cnt=0;
    for(int i=1;i<=n;i++)
    {
        int cur;
        cin>>cur;
        if(sum+(cnt+1)*(cur-1)>=p)
            break;
        sum+=cur;
        cnt++;
    }
    cout<<cnt;
}