# include <fstream>
using namespace std;
ifstream fin("teren.in");
ofstream fout("teren.out");
int v[301][301],n,m,k,i,j,x,maxim,y;
int main () {
    fin>>n>>m>>k;
    for(i=1;i<=n;i++){
        for(j=1;j<=m;j++){
            fin>>x;
            v[i][j]=v[i-1][j]+v[i][j-1]-v[i-1][j-1]+x;
        }
    }
    for(i=n;i>=1;i--){
        for(j=m;j>=1;j--){
            for(x=0;x<=i;x++){
                for(y=0;y<=j;y++){
                    if((v[i][j]-v[i-x][j]-v[i][j-y]+v[i-x][j-y])<=k&&x*y>maxim)
                        maxim=x*y;
                }
            }
        }
    }
    fout<<maxim;
    return 0;
}