#include <iostream>
#include <fstream>

using namespace std;

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

int a[301][301],i,j,n,m,k,maxi;

int main()
{
 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++)a[i][j]=a[i][j]+a[i][j-1]+a[i-1][j]-a[i-1][j-1];
 for(i=1;i<=n;i++)for(j=1;j<=m;j++)if(a[i][j]<=k&&i*j>maxi)maxi=i*j;
 g<<maxi;
 return 0;
}