#include <fstream>
using namespace std;
ifstream f("teren.in");
ofstream g("teren.out");
int n,m,x,i,j,s[301][302],S,st,dr,Max;
int main()
{
    f>>n>>m>>x;

    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
        {
            f>>s[i][j];
            s[i][j]+=s[i-1][j];
        }
    for(i=1;i<=n;i++)
        for(j=i;j<=n;j++)
        {
            st=1;
            dr=1;
            S=s[j][1]-s[i-1][1];

            while(dr<=m)
            {
                while(S<=x&&dr<=m)
                {
                    dr++;
                    S+=s[j][dr]-s[i-1][dr];
                }
                if(S-(s[j][dr]-s[i-1][dr])<=x)
                   Max=max((j-i+1)*(dr-st),Max);
                while(S>x&&st<dr)
                {
                    S-=(s[j][st]-s[i-1][st]);
                    st++;
                }

                dr++;
            }
        }
    g<<Max;
    return 0;
}