#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}

int main(){

    int N,K;
    cin >> N >> K;
    list(int,A,N);
    bitset<200000> x,s;
    int ans = 0;
    x.set(0,1);
    rep(i,0,N,1){
        x |= (x<<A[i]);
    }
    if(!x.test(K)){
        cout << -1 << endl;
        return 0;
    }
    for(auto a:A){
        if (!(x.test(K+a))){
            ans ++;
        }
    }
    cout << ans << endl;
    return 0;
}