#include<fstream>
using namespace std;
ifstream in("teren.in");
ofstream out("teren.out");
int n,m,M,q[303][303],x;
int main()
{
	in>>n>>m>>M;
	for (int i=1;i<=n;++i)
		for (int j=1;j<=m;++j)
		{
			in>>x;
			q[i][j]=q[i][j-1]+x;
		}
	int arieM=-1,j,s,i;
	for (int i1=1;i1<=m;++i1)
		for (int i2=i1;i2<=m;++i2)
		{
			j=0,s=0;
			for (i=1;i<=m;++i)
			{
				while (j<=n && s<=M)
				{
					++j;
					s+=q[j][i2]-q[j][i1-1];
				}
				if ((j-i)*(i2-i1+1)>arieM)
					arieM=(j-i)*(i2-i1+1);
				s-=q[i][i2]-q[i][i1-1];
			}
		}
	out<<arieM<<'\n';
	return 0;
}