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#include<bits/stdc++.h>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int n,m,k;
int a[502][502];
int main()
{
f>>n>>m>>k;
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j){
f>>a[i][j];
a[i][j]+=a[i-1][j]+a[i][j-1]-a[i-1][j-1];
}
int sol=0;
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
for(int q=1;q<=n;++q)
for(int y=1;y<=m;++y)
if(a[q][y]-a[i-1][y]-a[q][j-1]+a[i-1][j-1]<=k)
sol=max(sol,(q-i+1)*(y-j+1));
g<<sol<<'\n';
return 0;
}