#include <iostream>
#include <fstream>
#include <queue>

using namespace std;

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

const int N = 300;
int teren[N + 2][N + 2], sum[N + 2];

void reset(int m){
    int i;
    for(i = 1; i <= m; i++) sum[i] = 0;
}

int main()
{
    int n, m, x, i1, i2, j, amax, s, elim, l;
    fin >> n >> m >> x;
    for(i1 = 1; i1 <= n; i1++)
        for(j = 1; j <= m; j++) fin >> teren[i1][j];
    amax = 0;
    for(i1 = 1; i1 <= n; i1++){
        reset(m);
        for(i2 = i1; i2 <= n; i2++){
            for(j = 1; j <= m; j++) sum[j] += teren[i2][j];
            /// cautam subsirul de lungime maxima cu suma cel mult x in vectorul sum
            queue <int> Q;
            s = 0;
            for(j = 1; j <= m; j++){
                Q.push(sum[j]);
                s += sum[j];
                while(!Q.empty() && s > x){
                    elim = Q.front();
                    s -= elim;
                    Q.pop();
                }
                l = Q.size();
                amax = max(amax, l * (i2 - i1 + 1));
            }
        }
    }
    fout << amax;
    return 0;
}