#include <bits/stdc++.h>
//#define int long long
#define fi first
#define se second 
#define pb push_back
#define ott(i, l, r) for (int i = (l); i <= (r); i ++)
#define tto(i, l, r) for (int i = (r); i >= (l); i --)
using namespace std;
typedef double db;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
int read () {
	int x = 0; bool f = false; char c = getchar ();
	while (!isdigit (c)) f |= (c == '-'), c = getchar ();
	while (isdigit (c)) x = (x << 3) + (x << 1) + (c ^ 48), c = getchar ();
	return f ? -x : x;
}
const int N = 1e5 + 110, mod = 998244353, inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;
int n; ll p;
ll c[N];
int main () {
	n = read (), scanf ("%lld", &p);
	ott (i, 1, n) scanf ("%lld", &c[i]);
	if (c[1] > p) return puts ("0"), 0;
	ott (i, 1, n) {
		p -= 1ll * c[i];
		if (i == n || (c[i + 1] - 1) > 1.0 * p / (i + 1)) return printf ("%d\n", i), 0;
	}
    return 0;
}