#include <bits/stdc++.h>
#define vt vector
#define INF 1e9
#define pb push_back

using namespace std;

int n,m,k;
int v[303][303];
int s[303][303];
int b[303];

int main()
{
    freopen("teren.in","r",stdin);
    freopen("teren.out","w",stdout);

    scanf("%d %d %d",&n,&m,&k);

    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            scanf("%d",&v[i][j]);
            v[i][j]=v[i][j]+v[i-1][j];

        }
    }

    int hmax=0;
    for (int i = 1; i <= n ; ++i) {
        for (int j = i; j <= n ; ++j) {

            int nr=0,st=1;
            for (int dr = 1; dr <= m ; ++dr) {
                b[dr]=v[j][dr]-v[i-1][dr];
                nr=nr+b[dr];
                while (nr>k && st<dr){
                    nr-=b[st];
                    st++;
                }
                if(nr<=k)
                    hmax=max(hmax,(j-i+1)*(dr-st+1));
            }

        }
    }

    printf("%d",hmax);



    return 0;
}