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#include <iostream>
#include<fstream>
#include<deque>
using namespace std;
int i,j,n,m,i1,s[305][305],sum,var,k,mx,a;
int main()
{
ifstream f("teren.in");
ofstream g("teren.out");
f>>n>>m>>k;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
f>>a;
s[i][j]=s[i-1][j]+a;
}
for(i1=0;i1<=i-1;i1++)
{
deque<int> lin;sum=0;
for(j=1;j<=m;j++)
{
var=s[i][j]-s[i1][j];
sum+=var;
lin.push_back(var);
if(sum>k)
while(!lin.empty()&& sum>k)
{
sum-=lin.front();
lin.pop_front();
}
if(lin.size()*(i-i1)>mx) mx=lin.size()*(i-i1);
}
}
}
g<<mx;
return 0;
}