1 #include <vector>
 2 #include <iostream>
 3 using namespace std;
 4 int main()
 5 {
 6     int m, n;
 7     int i, j;
 8     while (cin >> m >> n)
 9     {
10         vector<vector<int>> ivec(m, vector<int>(n));
11         for (i = 0; i < m; ++i)
12         {
13             for (j = 0; j < n; ++j)
14             {
15                 cin >> ivec[i][j];
16             }
17         }
18         vector<vector<int>> dp(ivec);
19         for (i = 1; i < m; ++i)
20         {
21             dp[i][0] += dp[i - 1][0];
22         }
23         for (j = 1; j < n; ++j)
24         {
25             dp[0][j] += dp[0][j - 1];
26         }
27         for (i = 1; i < m; ++i)
28         {
29             for (j = 1; j < n; ++j)
30             {
31                 dp[i][j] += (dp[i - 1][j] < dp[i][j - 1]) ? dp[i][j - 1] : dp[i - 1][j];
32             }
33         }
34         cout << dp[m - 1][n - 1] << endl;
35     }
36     return 0;
37 }