include

using namespace std;

int main() {

int a[51][51];
int c[51][51];
int m, n;
cin >> m >> n;
for (int i = 0; i < m; i++) {
	for (int j = 0; j < n; j++) {
		cin >> a[i][j];
	}
}
for (int i = 0; i < m; i++) {
	for (int j = 0; j < n; j++) {
		cin >> c[i][j];
	}
}
int s = 0;
for (int i = 0; i < m; i++) {
	for (int j = 0; j < n; j++) {
		if (a[i][j] == c[i][j]) {
			s++;
		}
	}
}
cout << s;
return 0;

}