#include<bits/stdc++.h>
using namespace std;
using ll=long long;
int main(){
	ll n,k;cin>>n>>k;
	vector<ll> v(n);
	for(int i=0;i<n;i++) cin>>v[i];
	vector<vector<ll>> dp(n+1,vector<ll>(k+1,0));
	dp[0][0]=1;
	for(int i=1;i<=n;i++){
		ll x=v[i-1];
		for(int j=0;j<=k;j++){
			if(dp[i-1][j]&&j+x<=k){
				dp[i][j+x]+=dp[i-1][j];
			}
			if(dp[i-1][j]){
				dp[i][j]+=dp[i-1][j];
			}
		}
	}
	ll ans=dp[n][k];
	if(!ans){
		cout<<-1<<endl;
		return 0;
	}
	ll fans=0;
	for(int t=1;t<=n;t++){
		vector<vector<ll>> dp2(n+1,vector<ll>(k+1,0));
		dp2[0][0]=1;
    	for(int i=1;i<=n;i++){
	    	ll x=v[i-1];
		    for(int j=0;j<=k;j++){
			    if(dp2[i-1][j]&&j+x<=k&&i!=t){
				    dp2[i][j+x]+=dp2[i-1][j];
    			}
	    		if(dp2[i-1][j]){
		    		dp2[i][j]+=dp2[i-1][j];
			    }
	    	}
     	}
     	if(dp2[n][k]==0){
     		fans++;
     	}
	}
	cout<<fans<<endl;
}