#include <bits/stdc++.h>
using namespace std;

using i64 = long long;

void solve()
{
    int r, c;
    cin >> r >> c;
    vector<vector<int>> mp(r + 1, vector<int>(c + 1)), dp(r + 1, vector<int>(c + 1));
    for (int i = 1; i <= r; i++)
    {
        for (int j = 1; j <= c; j++)
        {
            cin >> mp[i][j];
        }
    }
    for (int i = 1; i <= r; i++)
    {
        for (int j = 1; j <= c; j++)
        {
            dp[i][j] = mp[i][j] + max(dp[i - 1][j], dp[i][j - 1]);
        }
    }
    cout << dp[r][c] << '\n';
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int _ = 1;

    cin >> _;
    while (_--)
    {
        solve();
    }
    return 0;
}