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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        if (n == 1) {
            System.out.println(0);
            return;
        }
        long[][] dp = new long[n][m];
        for (int i = 0; i < m; i++) {
            dp[0][i] = sc.nextInt();
        }
        for (int i = 1; i < n; i++) {
            long min = Long.MAX_VALUE;
            int idx = 0;
            int[] values = new int[m];
            for (int j = 0; j < m; j++) {
                values[j] = sc.nextInt();
                dp[i][j] = dp[i - 1][j] + values[j];
                min = Math.min(min, dp[i][j]);
            }
            for (int j = 0; j < m; j++) {
                dp[i][j] = Math.min(dp[i][j], min + values[j]);
            }
        }
        Arrays.sort(dp[n - 1]);
        System.out.println(dp[n - 1][0]);
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}