#include <bits/stdc++.h>
using namespace std;
int n,m,arr[50][50],sum[50],brr[950],q;
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	cin>>n>>m>>q;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>arr[i][j];
		}
	}
	for(int i=1;i<=q;i++){
		cin>>brr[i];
		bool flag=false;
		for(int j=1;j<=n;j++){
			if(flag){
				break;
			}
			for(int k=1;k<=m;k++){
				if(arr[j][k]==brr[i]){
					sum[j]++;
					flag=true;
					break;
				}
			}
		}
	}
	int maxx=0;
	for(int i=1;i<=n;i++){
		maxx=max(sum[i],maxx);
	}
	cout<<maxx;
	return 0;
}

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MyA0IDUKMTIgMyA1IDcKNiAxMCAxMSA5CjEgMiA0IDgKMgo0CjkKNgoxMQo=

3 4 5
12 3 5 7
6 10 11 9
1 2 4 8
2
4
9
6
11