#include <bits/stdc++.h>
using namespace std;
int n,m,l,t,f;
long long ans=0;
bool a[1005];
int main()
{
	freopen("kingdom.in","r",stdin);
	freopen("kingdom.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++)
		{
			scanf("%d",&l);
			if(l==1)t++;
			else f++;
		}
		if(t>f)a[i]=true;
		else a[i]=false;
		t=0;f=0;
	}
	for(int i=0;i<n;i++)
	{
		scanf("%d",&l);
		if(l==1&&a[i]==true)ans++;
		else if(l==0&&a[i]==false)ans++;
	}
	printf("%d",ans);
	fclose(stdin);
	fclose(stdout);
	return 0;
}