#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif

#include<bits/stdc++.h>

using namespace std;
#define int long long
#define app push_back
#define all(x) x.begin(), x.end()

#ifdef LOCAL
#define debug(...) [](auto...to){ ((cout << to << ' '), ...) << endl;}(#__VA_ARGS__, ":", __VA_ARGS__)
#define debugv(v) do { cout << #v << ": "; for (auto x : v) cout << x << ' '; cout << endl; } while(0)
#else
#define debug(...)
#define debugv(v)
#endif

void solve();

int32_t main() {
    cin.tie(0);
    ios_base::sync_with_stdio(0);
    int t = 1;
//    cin >> t;
    while (t--) solve();
}

void solve() {
    int n, c;
    cin >> n >> c;
    int sum = 0;
    for (int i = 0; i < n; ++i) {
        int p;
        cin >> p;
        if ((i + 1) * (p - 1) + sum >= c) {
            cout << i << '\n';
            return;
        }
        sum += p;
    }
    cout << n << '\n';
}