#include <stdio.h>
#include <string.h>

#define MAX_N 305
#define FIN "teren.in"
#define FOUT "teren.out"
#define max(a, b) ((a) > (b) ? (a) : (b))

int N, M, X, A[MAX_N][MAX_N], S[MAX_N], Res;

int main(void)
{
    int i, j, k, p, sum;

    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);

    scanf("%d %d %d", &N, &M, &X);
    for (i = 0; i < N; ++i)
        for (j = 0; j < M; ++j)
            scanf("%d", A[i]+j);

    for (i = 0; i < N; ++i)
    {
        memset(S, 0, sizeof(S));
        for (j = i; j < N; ++j)
            for (p = sum = k = 0; k < M; ++k)
            {
                S[k] += A[j][k]; sum += S[k];
                for (; p <= k && sum > X; ++p)
                    sum -= S[p];
                if (p > k) continue;
                Res = max(Res, (j-i+1)*(k-p+1)); 
            }
    }

    printf("%d\n", Res);

    return 0;
}