//teren
#include<stdio.h>
FILE*fin=fopen("teren.in","r");
FILE*fout=fopen("teren.out","w");
int main()
{
  int a[301][301],s[301][301],n,m;
  long nmax=0,i,j,c,ci,nx,x;
  fscanf(fin,"%d" "%d" "%ld",&n,&m,&x);
  for(i=1;i<=n;i++)
    for(j=1;j<=m;j++)
      fscanf(fin,"%d",&a[i][j]);
  fclose(fin);
  for(j=1;j<=m;j++)
  {
    s[0][j]=0;
    for(i=1;i<=n;i++)
      s[i][j]=s[i-1][j]+a[i][j];
  }
  for(i=1;i<=n;i++)
    for(j=i;j<=n;j++)
    {
      ci=1;nx=0;
      for(c=1;c<=m;c++)
      {
	nx=nx+s[j][c]-s[i-1][c];
	while(nx>x&&c>=ci){nx=nx-s[j][ci]+s[i-1][ci];ci++;}
        r=(c-ci+1)*(j-i+1);
	if(c>=ci&&r>nmax) nmax=r;
      }
    }
  fprintf(fout,"%ld",nmax);
  fclose(fout);
  return 0;
}