#include <fstream>

using namespace std;

ifstream in("teren.in");
ofstream out("teren.out");
int n, m, x;
int v[305][305];
int s[305];

int main()
{
    in>>n>>m>>x;

    for(int i = 1; i<=n; i++)
    {
        for(int j = 1; j<=m; j++)
        {
            in>>v[i][j];
        }
    }

    int ans = 0;

    for(int i = 1; i<=n; i++)
    {
        for(int j = 1; j<=m; j++)
        {
            s[j] = 0;
        }

        for(int i2 = i; i2<=n; i2++)
        {
            int st = 1;
            int total = 0;
            for(int j = 1; j<=m; j++)
            {
                s[j] += v[i2][j];
                total += s[j];

                while(total > x)
                {
                    total -= s[st];
                    st++;
                }

                ans = max(ans, (j - st + 1) * (i2 - i + 1));
            }
        }
    }

    out<<ans;

    return 0;
}