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

class Main {
    static class Reader {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader() {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException {
            byte[] buf = new byte[64]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1) {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            } while ((c = read()) >= '0' && c <= '9');

            if (c == '.') {
                while ((c = read()) >= '0' && c <= '9') {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException {
            if (din == null)
                return;
            din.close();
        }
    }

    static final Reader in = new Reader();
    static int N,K;
    static int[] a;
    static int[] b;
    static int[] c;

    static long[][] dp;

    public static void main(String[] args) throws Exception {
        N = in.nextInt();
        a = new int[N];
        b = new int[N];
        c = new int[N];
        dp = new long[N][3];

        for(int i = 0;i < N;i++)
        {
            a[i] = in.nextInt();
            b[i] = in.nextInt();
            c[i] = in.nextInt();
        }

        dp[0][0] = a[0];
        dp[0][1] = b[0];
        dp[0][2] = c[0];

        for(int i = 1;i < N;i++)
        {
            dp[i][0] = Math.max(dp[i-1][1],dp[i-1][2]) + a[i];
            dp[i][1] = Math.max(dp[i-1][0],dp[i-1][2]) + b[i];
            dp[i][2] = Math.max(dp[i-1][0],dp[i-1][1]) +c[i];
        }

        long ans= Math.max(dp[N-1][0],dp[N-1][1]);
        ans = Math.max(ans,dp[N-1][2]);
        System.out.println(ans);
    }
    
}

Measured memory_bytes: 38576