#include <bits/stdc++.h>

using namespace std;

string file_name = "9.txt";
// string file_name = "test.txt";

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    vector<vector<int>> heights;

    ifstream file_stream;
    file_stream.open(file_name);

    if(file_stream.is_open()){
        string line;

        while(getline(file_stream, line)){
            vector<int> line_input;

            for(const char &c : line){
                line_input.push_back(c - '0');
            }

            heights.push_back(line_input);
        }
    }

    // Test input parsing
    // for(auto v : heights){
    //     for(auto i : v){
    //         cout << i;
    //     } cout << endl;
    // } cout << endl;

    size_t HEIGHT = heights.size() - 1, WIDTH = heights[0].size() - 1;

    int result = 0;

    for(size_t i = 0; i <= HEIGHT; ++i){
        for(size_t j = 0; j <= WIDTH; ++j){
            bool lowest = true;
            int cur = heights[i][j];

            // Check on corner cases (ha literally)
            if(i != 0){
                lowest &= cur < heights[i - 1][j];
            }
            if(i != HEIGHT){
                lowest &= cur < heights[i + 1][j];
            }

            if(j != 0){
                lowest &= cur < heights[i][j - 1];
            }
            if(j != WIDTH){
                lowest &= cur < heights[i][j + 1];
            }

            if(lowest){
                result += cur + 1;
            }
        }
    }

    cout << result << endl;

    cout << flush;

    return 0;
}