#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
int main(){
	int n;
	ull a[200000],b;
	cin>>n>>b;
	for(int i=0;i<n;i++)
		cin>>a[i];
	sort(a,a+n);
	int d=bit_width(b)-1,cnt=0;
	ull dp[60];
	for(int i=0;i<d;i++)
		dp[i]=1ll<<i+1;
	for(int i=0;i<n;i++){
		int tmp=bit_width(a[i])-1;
		if(tmp<d){
			cnt++;
			b^=a[i];
		}else if(tmp==d)
			dp[d]=1;
		for(int j=0;j<tmp;j++)
			if(~a[i]>>j&1)
				dp[tmp]|=dp[j];
		if(tmp==d){
			if(dp[d]>>bit_width(b^a[i])&1){
				cout<<cnt+1<<endl;
				return 0;
			}
		}
	}
	cout<<cnt<<endl;
}