#include <fstream>
using namespace std;
int n,m,x,a,i,j,nr1,st,dr,sol,v[310][310];;
int main () {
    ifstream fin ("teren.in");
    ofstream fout("teren.out");
    fin>>n>>m>>x;
    for (i=1;i<=n;i++){
        for (j=1;j<=m;j++){
            fin>>a;
            v[i][j]=v[i-1][j]+a;
        }
    }
    for (i=1;i<=n;i++){
        for (j=i;j<=n;j++){
            st=1;
            nr1=0;
            for (dr=1;dr<=m;dr++){
                nr1+=(v[j][dr]-v[i-1][dr]);
                while(nr1>x&&st<=dr){
                    nr1-=(v[j][st]-v[i-1][st]);
                    st++;
                }
                if (st<=dr&&nr1<=x&&(j-i+1)*(dr-st+1)>=sol){
                    sol=(j-i+1)*(dr-st+1);
                }
            }
        }
    }
    fout<<sol;
    return 0;
}