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#include <bits/stdc++.h>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n, m, k, sp[302][302], smax;
int main()
{
int i, j, l, c, x;
fin>>n>>m>>k;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
fin>>x;
sp[i][j]=x+sp[i-1][j]+sp[i][j-1]-sp[i-1][j-1];
}
for(l=1; l<=n; l++)
for(c=1; c<=m; c++)
for(i=l; i<=n; i++)
for(j=c; j<=m; j++)
if(sp[i][j]-sp[i-l][j]-sp[i][j-c]+sp[i-l][j-c]<=k && l*c>smax)
smax=l*c;
fout<<smax<<'\n';
return 0;
}