#include <iostream>
using namespace std;
int main() {
int n, m, totalRevenue = 0;
cin >> n >> m;
int* tickets = new int[n * m];
for (int i = 0; i < n * m; i++) {
cin >> tickets[i];
}
for (int i = 0, isSold; i < n * m; i++) {
cin >> isSold;
totalRevenue += tickets[i] * isSold;
}
cout << totalRevenue;
return 0;
}
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