#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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