BAEKJOON_14391

import java.io.*;
import java.util.*;


public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br =new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw =new BufferedWriter(new OutputStreamWriter(System.out));

        StringTokenizer st = new StringTokenizer(br.readLine());

        int N = Integer.parseInt(st.nextToken());
        int M = Integer.parseInt(st.nextToken());
        int[][] arr =new int[N][M];

        for(int i=0; i<N; i++){
            StringBuilder sb= new StringBuilder(br.readLine());
            for(int j=0; j<M; j++){
                arr[i][j] = sb.charAt(j)-48;
            }
        }
        int max=0;
        int ans =0;

        for(int s=0; s<(1<<N*M); s++){
            int sum=0;

            for(int i=0; i<N; i++){
                int cur=0;
                for(int j=0; j<M; j++){
                    int k =i*M+j;
                    if((s&(1<<k))==0){
                        cur = cur * 10 +arr[i][j];
                    }else{
                        sum+=cur;
                        cur=0;
                    }
                }
                sum+=cur;
            }
            for(int j=0; j<M; j++){
                int cur=0;
                for(int i=0; i<N; i++){
                    int k =i*M+j;
                    if((s&(1<<k))!=0){
                        cur=cur * 10 +arr[i][j];
                    }else{
                        sum+=cur;
                        cur=0;
                    }
                }
                sum+=cur;
            }

            ans = Math.max(ans,sum);

        }
        System.out.println(ans);
    }
}