#include <iostream>
using namespace std;

int x[500][500];
int main(){
	int n, m, p;
	cin >> n >> m;
	for (int i = 0; i < n; i++)
		for (int j = 0; j < m; j++)
			cin >> x[i][j];
	unsigned long long v = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			cin >> p;
			if (p) v += x[i][j];
		}
    }
	cout << v;
}