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#include <bits/stdc++.h>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n, m, k, sc[302][302], sl[302], smax;
int main()
{
int i, j, l1, l2, q, x, st, dr, sp;
fin>>n>>m>>k;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
fin>>x;
sc[i][j]=x+sc[i-1][j];
}
for(l1=1; l1<=n; l1++)
for(l2=l1; l2<=n; l2++)
{
q=l2-l1+1;
for(i=1; i<=m; i++)
sl[i]=sc[l2][i]-sc[l1-1][i];
st=1, dr=0, sp=0;
while(dr<m)
{
sp+=sl[++dr];
if(sp<=k) smax=max(smax, q*(dr-st+1));
else
{
while(sp>k)
{
sp-=sl[st];
st++;
}
}
}
}
fout<<smax<<'\n';
return 0;
}