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#include <fstream>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
bool teren[301][301],stricat[301];
int main()
{int i,j,n,m,x,st=1,dr,s=0,A=0;
f>>n>>m>>x;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
f>>teren[i][j];
if(teren[i][j]==1)
{
stricat[j]++;
}
}
}
for(dr=1;dr<=m;dr++)
{
s=s+stricat[dr];
while(st<=dr&&s>x)
{
s=s-stricat[dr];
st=st+1;
}
if(st<=dr)
{
A=max(A,(j-i+1)*(dr-st+1));
}
}
g<<A;
f.close();
g.close();
return 0;
}