include <bits/stdc++.h>

using namespace std;

int s1[100][100] = {0};

int s2[100][100] = {0};

int main() {

int m, n;
cin >> m >> n;

for (int i = 1; i <= m; i++) {
	for (int j = 1; j <= n; j++) {
		cin >> s1[i][j];
	}
}
for (int i =  1; i <=  m; i++) {
	for (int j = 1; j <= n; j++) {
		cin >> s2[i][j];
	}
}
int sum = 0;
for (int i = 1; i <= m; i++) {
	for (int j = 1; j <= n; j++) {
		if (s1[i][j] == s2[i][j]) {
			sum++;
		}
	}
}
cout << sum;
return 0;

}