#include<fstream>
#define maxn 303

using namespace std;

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

int a[maxn][maxn],s[maxn][maxn],run[maxn],i,j,n,m,k,p,x,y,smax;

int main()
{
    f>>n>>m>>k;

    for(i=1;i<=n;++i)
        for(j=1;j<=m;++j)
            f>>a[i][j],s[i][j]=s[i-1][j]+a[i][j];

    for(i=1;i<=n;++i)
        for(j=i;j<=n;++j)
        {
            for(p=1;p<=m;++p)
                run[p]=s[j][p]-s[i-1][p]+run[p-1];

            x=1;
            y=0;
            while(x<=n)
            {
                while(run[y+1]-run[x-1]<=k&&y<m)
                    ++y;
                if((y-x+1)*(j-i+1)>smax)
                    smax=(y-x+1)*(j-i+1);
                ++x;
            }
        }

    g<<smax<<"\n";

    f.close();
    g.close();

    return 0;
}