#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int a[310][310],b[310],m,n,i,j,x,smax,p,u,y,k,s;
int main()
{
    fin >>n>>m>>x;
    smax=-1;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=m;j++)
        {
            fin>>y;
            a[i][j]=a[i-1][j]+y;

        }
    }
    for(i=1;i<=n;i++)
    {
        for(j=i;j<=n;j++)
        {
            for(k=1;k<=m;k++)
            {
                b[k]=a[j][k]-a[i-1][k];
            }
            p=1;
            u=1;
            s=0;
            while(u<=m)
            {
                while(b[u]+s<=x&&u<=m)
                {
                    s=s+b[u];
                    u++;
                }
                s=s-b[p];
                if (smax<(j-i+1)*(u-p))
                    smax=(j-i+1)*(u-p);
                p++;
            }
        }
    }
    fout <<smax;
    return 0;
}