#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long
#define fi first
#define se second
#define mpr make_pair

int n;
ll p;
ll c;
ll s;
void solve(){
    s=0;
    cin>>n>>p;
    int ans=n;
    for(int i=1;i<=n;i++){
        cin>>c;
        if(1ll*i*(c-1)+s>=p){
            ans=min(ans,i-1);
        }
        s+=c;
    }
    cout<<ans<<"\n";
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
    return 0;
}