#include <bits/stdc++.h>

#define rep(i,n) for(long long int (i)=0;(i)<(int)(n);(i)++)
#define rrep(i,a,b) for(long long int i=(a);i<(b);i++)
#define rrrep(i,a,b) for(long long int i=(a);i>=(b);i--)
#define all(v) (v).begin(), (v).end()
#define pb(q) push_back(q)
#define Abs(a,b) max(a,b)-min(a,b)
#define YES(condition) if(condition){cout << "YES" << endl;}else{cout << "NO" << endl;}
#define Yes(condition) if(condition){cout << "Yes" << endl;}else{cout << "No" << endl;}
#define Cout(x) cout<<(x)<<endl
#define POSSIBLE(condition) if(condition){cout << "POSSIBLE" << endl;}else{cout << "IMPOSSIBLE" << endl;}
#define Possible(condition) if(condition){cout << "Possible" << endl;}else{cout << "Impossible" << endl;}
#define possible(condition) if(condition){cout << "possible" << endl;}else{cout << "impossible" << endl;}
#define Size(n) (n).size()

typedef long long ll;


using namespace std;

const int INF = 1e9,MOD = 1e9 + 7,ohara=1e6;
const ll LINF = 1e18;

/*---------------------------------------------------------------
long long int kaizyo(long long int hh){
    cmp=1;
    while(hh>1){
        cmp=(cmp*hh)%MOD;
        hh--;
    }
    return cmp;
}
long long int ruizyo(long long int aa, long long int bb){
    if(aa==0){
        return 1;
    }
    else if(aa%2==0){
        long long int tt=ruizyo(aa/2,bb);
        return (tt*tt)%MOD;
    }
    else{
        return (ruizyo(aa-1,bb)*bb)%MOD;
    }
}フェルマ－のア
---------------------------------------------------------------

while(x!=0){
            sum+=x%10;
          / x/=10;
        }
        各桁の和
---------------------------------------------------------------

pair<int,int> p[100000];
cin >> tmp;
p[i]=make_pair(tmp,i);
cout << p[i].second+1 << endl;//ペアの右側つまりiを出力

---------------------------------------------------------------

bool f[100001];//1000000以下の素数を調べよう！
rrep(i,2,100001){
       f[i]=false;
    }
rrep(i,2,100001){
        if(!f[i]){
            for(int j=i+i;j<=100000;j+=i){
                f[j]=true;
            }
        }
    }
    for(int i=3;i<=100000;i+=2){
        if(!f[i]){
            c[i]++;
        }
    }

---------------------------------------------------------------

long long gcd(long long aaa,long long bbb){
    if(bbb==0){
        return aaa;
    }
    return gcd(bbb,aaa%bbb);
}
 
long long lcm(long long aaa,long long bbb){
    long long g = gcd(aaa,bbb);
    return aaa/g * bbb;
}左から最大公約数と最小公倍数


---------------------------------------------------------------

long long int prime_cnt[10000];
       for(int i=2;i*i<=n;i++){
           while(n%i==0){
               n/=i;
               prime_cnt[i]+=1;
           }
           if(n>1){
               prime_cnt[n]+=1;
               break;
           }
      }ある数nを素因数分解しましょう

---------------------------------------------------------------
debug:
cout<<"i: "<<i<<" j: "<<j<<" cnt: "<<cnt<<"\n";

---------------------------------------------------------------*/

long long int n,cnt=0,ans=0,a,b,c,d,cmp[100][100],cmpp[100][100],m,h,w,sum=0,pos,k;
int dy[]={1,0,-1,0};
int dx[]={0,1,0,-1};
string alph("abcdefghijklmnopqrstuvwxyz"),s;
bool fl=true;
struct edge{int to,cost;};

//-------------------------↓↓↓↓↓↓------------------------

int main(void){
       cin.tie(0);
    ios::sync_with_stdio(false);

      
       cin>>h>>w>>k;
  		ans=0;
       rep(i,h){
           cin>>s;
           rep(j,w){
               cmp[i][j]=(s[j]-'0');
           }
       }
      
      ll cntt=0,val=0;
      rep(i,h){
          rep(j,w){

              rep(y,h){
                  rep(x,w){
                      cmpp[y][x]=cmp[y][x];
                  }
              }
            
            rrrep(y,i,0){
                if(y==0){
                    cmpp[y][j]=0;
                }
                else{
                    cmpp[y][j]=cmpp[y-1][j];
                }
            }

           while(1){
               bool ok=false;
               rep(y,h){
                   cntt=1;
                   rep(x,w){
                       if(cmpp[y][x]==cmpp[y][x+1]){
                           cntt++;
                       }
                       if(x==w-1||cmpp[y][x]!=cmpp[y][x+1]){
                           if(cntt>=k){
                               cnt+=cmpp[y][x]*cntt*pow(2,val);
                              // cout<<cmpp[y][x]<<" "<<cntt<<" "<<pow(2,val)<<"\n";
                               cntt=1;
                               if(cmpp[y][x]!=0){
                               ok=true;
                               }
                           }
                            cntt=1;
                       }
                   }
               }

               rep(y,h){
                   cntt=1;
                   ll le=0,ri=0;
                   rep(x,w){
                       if(cmpp[y][x]==cmpp[y][x+1]&&cmpp[y][x]!=0){
                           cntt++;
                           ri++;
                       }
                        if(x==w-1||cmpp[y][x]!=cmpp[y][x+1]){
                            if(cmpp[y][x]==0){
                                  le=x+1;
                               ri=le;
                           cntt=1;
                           continue;
                            }
                           if(cntt>=k){
                               rrrep(yy,y,0){
                               rrep(xx,le,ri+1){
                                   if(yy==0){
                                       cmpp[yy][xx]=0;
                                   }
                                   else{
                                   cmpp[yy][xx]=cmpp[yy-1][xx];
                                   }
                               }
                               }
                           }
                               le=x+1;
                               ri=le;
                           cntt=1;
                       }
                   }
               }

               if(!ok)break;
               val++;
           }
           ans=max(ans,cnt);
           cnt=0;
           val=0;

          }
      }
      Cout(ans);
return 0;
}


Measured memory_bytes: 256