#include <bits/stdc++.h>

using namespace std;

#define endl '\n'

#define TRACE 1
#define tcout TRACE && cout

#define fst ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define int long long

const int P = 998244353;
const int Base = 3221225477;
const int INF = 0x3f3f3f3f3f3f3f3f;

const int N = 1e6 + 10, M = 2e6 + 10;

int n,m,cnt;
int a[N];

signed main()
{
	cin>>n>>m;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
	}
	sort(a+1,a+n+1);
	for(int i=n;i>=1;i--)
	{
		if(m<=0)
		{
			cout<<cnt;
			return 0;
		}
		m-=a[i];
		cnt++;
	}
	cout<<-1;
	return 0;
}