#include <iostream>
using namespace std;
int main() {
int num[3][3];
int *p = &num[0][0];
int sum = 0;
for (int i = 0; i < 9; i++) {
cin >> *(p + i);
}
for (int i = 0; i < 9; i++) {
sum += *(p + i);
}
cout << sum << endl;
return 0;
}
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