#include <bits/stdc++.h>

using namespace std;

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

int a[301][301],s[301][301];

int main(){
   int n,m,i,j,k,amax=0,ar,ii,jj,fi,jf,sum;
   f>>n>>m>>k;
   for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
            f>>a[i][j];

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

   i=1;
   while(i<=n)
   {
       for(j=1;j<=m;j++)
            for(ii=n;ii>=1;ii--)
                for(jj=m;jj>=1;jj--)
                    {
                        sum=s[ii][jj]-s[i-1][jj]-s[ii][j-1]+s[i-1][j-1];
                        ar=(ii-i+1)*(jj-j+1);
                        if( (ar>amax) && (sum<=k) )
                                {
                                    amax=ar;
                                    j++;
                                }
                    }
        i++;
   }
    g<<amax;
}