#include<bits/stdc++.h>
using namespace std;
//#include<atcoder/all>
//using namespace atcoder;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
constexpr ll MAX = 2000000000000000000;
constexpr ld PI = 3.14159265358979;
constexpr ll MOD = 0;//2024948111;
ld dotorad(ld K){return PI * K / 180.0;}
ld radtodo(ld K){return K * 180.0 / PI;}
mt19937 mt;
void randinit(){srand((unsigned)time(NULL));mt = mt19937(rand());}
int main(){
    ll N,K;
    cin >> N >> K;
    vector<ll> A(N);
    for(ll i = 0;i < N;i++) cin >> A[i];
    vector<bitset<200000>> B(N + 1);
    B[0].set(0);
    for(ll i = 0;i < N;i++){
        B[i + 1] = B[i] | (B[i] << A[i]);
    }
    vector<bitset<200000>> C(N + 1);
    C[N].set(K);
    for(ll i = N;i > 0;i--){
        C[i - 1] = C[i] | (C[i] >> A[i - 1]);
    }
    if(B[N][K]){
        ll ans = 0;
        for(ll i = 0;i < N;i++){
            if((B[i] & C[i + 1]) == 0) ans++;
        }
        cout << ans << endl;
    }
    else cout << -1 << endl;
}