#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;
ll mod=998244353;
ll inva(ll N) {
    ll a = N, b = mod, c = 1, d = 0;
    while (b > 0) {
        ll t = a / b;
        a -= t * b;
        swap(a, b);
        c -= t * d;
        swap(c, d);

    }
    c %= mod;
    if (c < 0)c += mod;
    return c;

}//割り算時に使う逆元を求める.


int main() {
    ll H,W,N;
    cin>>H>>W>>N;
    vector<vll> C(H,vll(W));
    rep(h,H)rep(w,W)cin>>C[h][w];
    vector<pair<ll,ll>> Q;
    rep(h,H)rep(w,W-1){
        Q.push_back(make_pair(max(C[h][w],C[h][w+1]),min(C[h][w],C[h][w+1])));
    }
    rep(h,H-1)rep(w,W){
        Q.push_back(make_pair(max(C[h][w],C[h+1][w]),min(C[h][w],C[h+1][w])));
    }
    sort(all(Q));
    ll R=-1;
    ll an=0;
    rep(q,Q.size()){
        if(Q[q].second==Q[q].first)continue;
        if(Q[q].second>=R){
            R=Q[q].first;
            an++;
        }
    }
    cout<<1+an<<endl;
    
}