BOJ11048.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class BOJ11048 {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        int N = Integer.parseInt(st.nextToken());
        int M = Integer.parseInt(st.nextToken());

        int[][] dp = new int[N+1][M+1];

        
        for(int i = 1; i <= N; i++){
            st = new StringTokenizer(br.readLine());
            for(int j = 1; j <= M; j++){
                dp[i][j] = Integer.parseInt(st.nextToken());
            }
        }

        for(int i = 1; i <= N; i++){
            for(int j = 1; j <= M; j++){
                dp[i][j] = Math.max(dp[i-1][j], Math.max(dp[i][j-1], dp[i-1][j-1])) + dp[i][j];
            }
        }

        System.out.print(dp[N][M]);
    }
}