#include
     
      using namespace std;map
      
        ans;int main(){    ios::sync_with_stdio(false);    int n,m;    cin>>n>>m;    for(int i=0;i
       
        >x;            a=a<<1;            a+=x;        }        ans[a]++;    }    int sum =0;    int maxn = (1<
        
         ::iterator it=ans.begin(); it!=ans.end();it++)    {        int x = it->first;        int num = x^maxn;        sum += ans[num]*it->second;    }    cout<