#include <iostream>
#include <fstream>
using namespace std;

ifstream in ("teren.in");
ofstream out ("teren.out");

int n,m,c;
int v[305][305];

int main()
{
    in>>n>>m>>c;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <=m ; j++)
        {
            in>>v[i][j];
            v[i][j]+=v[i-1][j];
        }
    int maxx=-1;
    for(int i = 1; i <= n; i++)
        for(int j = i; j <= n; j++)
        {
            int k=1, sum=0;
            for(int f = 1; f <= m; f++)
            {
                sum+=v[j][f]-v[i-1][f];
                while(sum > c)
                {
                    sum-=v[j][k]-v[i-1][k];
                    k++;
                }
                if(maxx < (f-k+1)*(j-i+1))
                    maxx=(f-k+1)*(j-i+1);
            }
        }
    out<<maxx;
    return 0;
}