#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("inline")
#include<bits/stdc++.h>
using namespace std;
void*wmem;
char memarr[96000000];
template<class T> inline void walloc1d(T **arr, int x, void **mem = &wmem){
  static int skip[16] = {0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};
  (*mem) = (void*)( ((char*)(*mem)) + skip[((unsigned long long)(*mem)) & 15] );
  (*arr)=(T*)(*mem);
  (*mem)=((*arr)+x);
}
template<class T> inline void walloc1d(T **arr, int x1, int x2, void **mem = &wmem){
  walloc1d(arr, x2-x1, mem);
  (*arr) -= x1;
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
template<class S, class T> inline S chmax(S &a, T b){
  if(a<b){
    a=b;
  }
  return a;
}
struct unionFind{
  int*d;
  int N;
  int M;
  inline void malloc(const int n){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
  }
  inline void malloc(const int n, const int fg){
    d = (int*)std::malloc(n*sizeof(int));
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void free(void){
    std::free(d);
  }
  inline void walloc(const int n, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
  }
  inline void walloc(const int n, const int fg, void **mem=&wmem){
    walloc1d(&d, n, mem);
    M = n;
    if(fg){
      init(n);
    }
  }
  inline void init(const int n){
    int i;
    N = n;
    for(i=(0);i<(n);i++){
      d[i] = -1;
    }
  }
  inline void init(void){
    init(M);
  }
  inline int get(int a){
    int t = a;
    int k;
    while(d[t]>=0){
      t=d[t];
    }
    while(d[a]>=0){
      k=d[a];
      d[a]=t;
      a=k;
    }
    return a;
  }
  inline int connect(int a, int b){
    if(d[a]>=0){
      a=get(a);
    }
    if(d[b]>=0){
      b=get(b);
    }
    if(a==b){
      return 0;
    }
    if(d[a] < d[b]){
      d[a] += d[b];
      d[b] = a;
    }
    else{
      d[b] += d[a];
      d[a] = b;
    }
    return 1;
  }
  inline int operator()(int a){
    return get(a);
  }
  inline int operator()(int a, int b){
    return connect(a,b);
  }
  inline int& operator[](const int a){
    return d[a];
  }
  inline int size(int a){
    a = get(a);
    return -d[a];
  }
  inline int sizeList(int res[]){
    int i;
    int sz=0;
    for(i=(0);i<(N);i++){
      if(d[i]<0){
        res[sz++] = -d[i];
      }
    }
    return sz;
  }
  inline int comp(int res[], void *mem = wmem){
    int i;
    int sz=0;
    int*cnt;
    walloc1d(&cnt, N, &mem);
    for(i=(0);i<(N);i++){
      cnt[i] = 0;
    }
    for(i=(0);i<(N);i++){
      cnt[get(i)] = 1;
    }
    for(i=(0);i<(N);i++){
      if(cnt[i]){
        cnt[i] = sz++;
      }
    }
    for(i=(0);i<(N);i++){
      res[i] = cnt[get(i)];
    }
    return sz;
  }
}
;
int X;
int Y;
int N;
int C[1000][1000];
unionFind uf;
int edge[1000000];
int main(){
  int i;
  wmem = memarr;
  int x;
  int y;
  int s;
  int res = 1;
  rd(X);
  rd(Y);
  rd(N);
  {
    int Lj4PdHRW;
    int KL2GvlyY;
    for(Lj4PdHRW=(0);Lj4PdHRW<(X);Lj4PdHRW++){
      for(KL2GvlyY=(0);KL2GvlyY<(Y);KL2GvlyY++){
        rd(C[Lj4PdHRW][KL2GvlyY]);C[Lj4PdHRW][KL2GvlyY] += (-1);
      }
    }
  }
  for(i=(0);i<(N);i++){
    edge[i] = -1;
  }
  for(i=(0);i<(X);i++){
    int j;
    for(j=(0);j<(Y);j++){
      int ni, nj;
      static int tU__gIr_[4] = {-1, 0, 0, 1};
      static int a2conNHc[4] = {0, -1, 1, 0};
      int hCmBdyQB;
      for(hCmBdyQB=(0);hCmBdyQB<(4);hCmBdyQB++){
        ni = (i) + tU__gIr_[hCmBdyQB];
        nj = (j) + a2conNHc[hCmBdyQB];
        if(0 <= ni  &&  ni < X && 0 <= nj  &&  nj < Y && C[i][j] != C[ni][nj]){
          auto YREPHmFM = ((C[i][j]));
          auto jZyWAPpY = (( C[ni][nj]));
          x=YREPHmFM;
          y=jZyWAPpY;
          if(x > y){
            swap(x, y);
          }
          ;
          chmax(edge[y], x);
        }
      }
    }
  }
  s = 0;
  for(i=(1);i<(N);i++){
    if(edge[i] >= s){
      res++;
      s = i;
    }
  }
  wt_L(res);
  wt_L('\n');
  return 0;
}
// cLay version 20210819-1 [beta]

// --- original code ---
// int X, Y, N, C[1000][1000];
// unionFind uf;
// int edge[1d6];
// {
//   int x, y, s, res = 1;
//   rd(X,Y,N,(C--)(X,Y));
//   rep(i,N) edge[i] = -1;
//   rep(i,X) rep(j,Y){
//     rep_dist(ni,nj,i,j) if(0 <= ni < X && 0 <= nj < Y && C[i][j] != C[ni][nj]){
//       (x, y) = (C[i][j], C[ni][nj]);
//       sortE(x, y);
//       edge[y] >?= x;
//     }
//   }
//   s = 0;
//   rep(i,1,N){
//     if(edge[i] >= s){
//       res++;
//       s = i;
//     }
//   }
//   wt(res);
// }