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#include <bits/stdc++.h>
using namespace std;
const int N = 10;
int a[N][N];
int main() {
int n = 3;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= n; j++)
cin >> a[i][j];
int s = 0;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= n; j++)
if (i == j) s += a[i][j];
cout << s << endl;
return 0;
}