#nullable enable

int h, w, k;
{
    var input = Console.ReadLine()!.Split(' ');
    h = int.Parse(input[0]);
    w = int.Parse(input[1]);
    k = int.Parse(input[2]);
}
var az = new int[h, w];
var bz = new int[h, w];
for (var _i = 0; _i < 2; _i++)
{
    for (var i = 0; i < h; i++)
    {
        var input = Console.ReadLine()!.Split(' ');
        for (var j = 0; j < w; j++) az[i, j] = int.Parse(input[j]);
    }
    (az, bz) = (bz, az);
}
var aSumI = new int[h];
var aSumJ = new int[w];
var bMinI = new int[h];
var bMinJ = new int[w];
bMinI.AsSpan().Fill(int.MaxValue);
bMinJ.AsSpan().Fill(int.MaxValue);
for (var i = 0; i < h; i++) for (var j = 0; j < w; j++)
{
    var a = az[i, j];
    aSumI[i] += a;
    aSumJ[j] += a;
    var b = bz[i, j];
    bMinI[i] = Math.Min(bMinI[i], b);
    bMinJ[j] = Math.Min(bMinJ[j], b);
}
long SolveIJ(long si, long sj, int ci, int cj)
{
    if (cj <= ci) (si, sj, ci, cj) = (sj, si, cj, ci);
    var l = k / cj;
    var p = k % cj / ci;
    var t = cj / ci;
    var center = (long)((l - sj + (double)(p + si) / t) / 2);
    if (center < 0) center = 0;
    if (center > l) center = l;
    var res = 0L;
    for (var dj = center - 1; dj <= center + 1; dj++)
    {
        if (dj < 0 || l < dj) continue;
        var di = l - dj;
        res = Math.Max(res, (si + p + t * di) * (sj + dj));
    }
    return res;
}
long SolveIC(long si, long sj, int ci, int cc)
{
    if (cc <= ci) return (si + k / cc) * (sj + k / cc);
    var l = k / cc;
    var p = k % cc / ci;
    var t = cc / ci;
    var center = -(long)((sj + (double)(si + p + t * l) / (1 - t)) / 2);
    if (center < 0) center = 0;
    if (center > l) center = l;
    var res = 0L;
    for (var dc = center - 1; dc <= center + 1; dc++)
    {
        if (dc < 0 || l < dc) continue;
        var di = l - dc;
        res = Math.Max(res, (si + p + t * di + dc) * (sj + dc));
    }
    return res;
}
var ans = 0L;
for (var i = 0; i < h; i++) for (var j = 0; j < w; j++)
{
    var (si, sj) = (aSumI[i], aSumJ[j]);
    var (ci, cj, cc) = (bMinI[i], bMinJ[j], bz[i, j]);
    ans = Math.Max(ans, SolveIJ(si, sj, ci, cj));
    ans = Math.Max(ans, SolveIC(si, sj, ci, cc));
    ans = Math.Max(ans, SolveIC(sj, si, cj, cc));
}
Console.WriteLine(ans);