/*************************

程序名: 1241 - 奶牛相似性
作者: 李品毅
日期: 2024-05-26 11:42
说明: 无

*************************/

include

using namespace std;

int main() {

int a[110][110];
int n, m, count = 0;
scanf("%d%d", &n, &m);
for (int i = 1; i <= n * 2; i++)
	for (int j = 1; j <= m; j++)
		scanf("%d", &a[i][j]);
for (int i = 1; i <= n; i++) {
	for (int j = 1; j <= m; j++) {
		if (a[i][j] == a[i + n][j])
			count++;
	}
}
printf("%d", count);
return 0;

}