#include<stdio.h>
int n,m,x,a[301][301],s[301][301],l[301],i,j,k,count,pam,in=1;
int main()
{
    freopen("teren.in","r",stdin);
    freopen("teren.out","w",stdout);
    scanf("%d%d%d",&n,&m,&x);
    for(i=1;i<=n;i++)
    for(j=1;j<=m;j++)
    scanf("%d",&a[i][j]);
    for(j=1;j<=m;j++)
    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++)
        {
            count=0;
            in=1;
            for(k=1;k<=m;k++)
            l[k]=s[j][k]-s[i-1][k];
            for(k=1;k<=m;k++)
            {
                count+=l[k];
                while(in<=k&&count>x)
                count-=l[in],in++;
                if((j-i+1)*(k-in+1)>pam)
                pam=(j-i+1)*(k-in+1) ;
            }
        }
    printf("%d",pam);
    return 0;
}