#include <bits/stdc++.h>
using namespace std;
int main() {
vector<vector<int>> matrix;
int cell;
string srow;
while (getline(cin, srow)) {
if (srow.empty()) break;
vector<int> row;
stringstream value(srow);
while (value >> cell) row.push_back(cell);
matrix.push_back(row);
}
int sum = 0;
for (int i = 0; i < matrix.size(); i++)
for (int j = 0; j < matrix[0].size(); j++)
if (i == 0 || i == matrix.size() - 1 || j == 0 || j == matrix[0].size() - 1)
sum += matrix[i][j];
cout << sum;
return 0;
}