#include <fstream>

using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n,x,m,i,j,y,v[1001][1001],st,dr,i1,i2,sum[1001][1001],s,maxx;
int main()
{
    fin>>n>>m>>x;
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=m; j++)

        {
            fin>>y;

            sum[i][j]=sum[i-1][j]+y;
        }

    }
    for(i1=1; i1<n; i++)
        for(i2=i1; i2<=n; i2++)
        {
            st=1;s=0;///st=coloana din stanga
            for(dr=1;dr<=m;dr++)
            {
              s+=sum[i2][dr]-sum[i1-1][dr];
              while(st<=dr && s>x)
              {
                  s=s-(sum[i2][st]-sum[i1-1][dr]);
                  st++;
              }
              if((i2-i1+1)*(dr-st+1)>maxx)
              maxx=(i2-i1+1)*(dr-st+1);


            }

        }
        fout<<maxx;

    return 0;
}