#include <bits/stdc++.h>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int n,i,j,m,l,k,c,s[310][310],x,lin1,lin2,dr,st,maxi;
int main()
{
    fin>>n>>m>>c;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            fin>>x,s[i][j]=s[i-1][j]+s[i][j-1]-s[i-1][j-1]+x;
    for(lin1=1;lin1<=n;lin1++)
        for(lin2=lin1;lin2<=n;lin2++)
        {
            dr=m;
            st=m;
            while(st>1)
            {
                while(s[lin2][dr]-s[lin2][st-1]-s[lin1-1][dr]+s[lin1-1][st-1]<=c && st>1)
                    st--;
                maxi=max(maxi,(lin2-lin1+1)*(dr-st+1));
                dr--;
            }
        }
    fout<<maxi;
    return 0;
}