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#include<iostream>
#include<fstream>
#include<math.h>
#include<algorithm>
#define DIM 10010
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int v[1003][1003],s[1003][1003],i,j,n,p,k,nr,maxim,x,cin1,cin2,ii,jj,a;
int main(){
fin>>n>>p>>k;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
fin>>v[i][j];
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
s[i][j]=v[i][j]+s[i-1][j]+s[i][j-1]-s[i-1][j-1];
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{
for(ii=i;ii<=n;ii++)
for(jj=j;jj<=n;jj++)
{
x=s[ii][jj]-s[ii][j-1]-s[i-1][jj]+s[i-1][j-1];
if(x<=k)
{
a=(ii-1+1)*(jj-j+1);
if(a>maxim)
maxim=a;
}
}
}
fout<<maxim;
fin.close();
fout.close();
return 0;
}