#include <iostream>
using namespace std;

int main() {
	int x [500*500];
	int n, m;
	cin >> n >> m;
	int nm= n*m;
	for(int i = 1; i <= nm; i++){
		cin >> x[i];
	}
	int k;
	long long int v = 0;
	for(int i = 1; i <= nm; i++){
		cin >> k;
		v+= k*x[i];
	}
	cout << v << endl;
	return 0;
}