#include <iostream>
#include <vector>
#include <cstdio>

int N,M,D; // rows, cols, d->разстояние
std::vector< std::vector<int> > matrix;

int findDist(int row,int col);
int main()
{
    freopen("rabbits.in", "r", stdin);
    freopen("rabbits.out", "w", stdout);

    scanf("%d %d %d", &N, &M, &D);

    matrix.resize(N);
    int currentPosition;
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < M; j++)
        {
            scanf("%d", &currentPosition);
            matrix[i].push_back(currentPosition);
        }
    }

    int max = -1;
    int currentMax = -1;

    for(int i = 0; i < N; i++)
    {

        for(int j = 0; j < M; j++)
        {
           currentMax = findDist(i, j);

           if(currentMax >= max)
                max = currentMax;
        }
    }
    printf("%d ", max);

    return 0;
}

int findDist(int row,int col)
{
    if(D + col < M)
    {
        int dCol = D;
        return matrix[row][col] + matrix[row][dCol];
    }

    else
    {
        int dRow = (D % N) + 1;
        if(dRow == N)
            dRow = 0;
        int dCol = (D + col) % M;

        return matrix[row][col] + matrix[dRow][dCol];
    }
}