#include <bits/stdc++.h>
using namespace std;

#define all(a) (a).begin(), (a).end()
using ll = long long;
using ull = unsigned long long;
using vll = vector<ll>;
ull bit(int n) { return 1ull << n; }
ll sign(ll a) { return (a > 0) - (a < 0); }
ll fdiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); }
ll cdiv(ll a, ll b) { return -fdiv(-a, b); }
constexpr ll DY[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr ll DX[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
template <typename T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
template <typename T> T sq(const T &a) { return a * a; }
template <typename T, typename U> bool chmax(T &a, const U &b) { return ((a < b) ? (a = b, true) : (false)); }
template <typename T, typename U> bool chmin(T &a, const U &b) { return ((a > b) ? (a = b, true) : (false)); }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &a) {
    os << "(";
    for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); }
    os << ")";
    return os;
}

#ifdef ONLINE_JUDGE
#define dump(...) (void(0))
#else
void debug() { cerr << endl; }
template <typename Head, typename... Tail> void debug(Head &&head, Tail &&... tail) {
    cerr << head;
    if (sizeof...(Tail)) cerr << ", ";
    debug(tail...);
}
#define dump(...) cerr << __LINE__ << ": " << #__VA_ARGS__ << " = ", debug(__VA_ARGS__)
#endif

struct rep {
    struct itr {
        int v;
        itr(int v) : v(v) {}
        void operator++() { ++v; }
        int operator*() const { return v; }
        bool operator!=(const itr &i) const { return v != i.v; }
    };
    int l, r;
    rep(int r) : l(min(0, r)), r(r) {}
    rep(int l, int r) : l(min(l, r)), r(r) {}
    itr begin() const { return l; };
    itr end() const { return r; };
};
struct per {
    struct itr {
        int v;
        itr(int v) : v(v) {}
        void operator++() { --v; }
        int operator*() const { return v; }
        bool operator!=(const itr &i) const { return v != i.v; }
    };
    int l, r;
    per(int r) : l(min(0, r)), r(r) {}
    per(int l, int r) : l(min(l, r)), r(r) {}
    itr begin() const { return r - 1; };
    itr end() const { return l - 1; };
};

ll MOD;
struct modint {
    ll val;
    modint(ll val = 0) : val(val >= 0 ? val % MOD : (MOD - (-val) % MOD) % MOD) {}
    static ll mod() { return MOD; }
    modint inv() const {
        ll a = val, b = MOD, u = 1, v = 0, t;
        while (b > 0) {
            t = a / b;
            swap(a -= t * b, b);
            swap(u -= t * v, v);
        }
        return modint(u);
    }
    modint pow(ll k) const {
        modint ret = 1, mul = val;
        while (k) {
            if (k & 1) ret *= mul;
            mul *= mul;
            k >>= 1;
        }
        return ret;
    }
    modint &operator+=(const modint &a) {
        if ((val += a.val) >= MOD) val -= MOD;
        return *this;
    }
    modint &operator-=(const modint &a) {
        if ((val += MOD - a.val) >= MOD) val -= MOD;
        return *this;
    }
    modint &operator*=(const modint &a) {
        (val *= a.val) %= MOD;
        return *this;
    }
    modint &operator/=(const modint &a) { return *this *= a.inv(); }
    bool operator==(const modint &a) const { return val == a.val; }
    bool operator!=(const modint &a) const { return rel_ops::operator!=(*this, a); }
    modint operator+() const { return *this; }
    modint operator-() const { return modint(-val); }
    friend modint operator+(const modint &a, const modint &b) { return modint(a) += b; }
    friend modint operator-(const modint &a, const modint &b) { return modint(a) -= b; }
    friend modint operator*(const modint &a, const modint &b) { return modint(a) *= b; }
    friend modint operator/(const modint &a, const modint &b) { return modint(a) /= b; }
    friend istream &operator>>(istream &is, modint &a) {
        ll val;
        is >> val;
        a = modint(val);
        return is;
    }
    friend ostream &operator<<(ostream &os, const modint &a) { return os << a.val; }
};
using mint = modint;

template <typename mint> struct combination {
    vector<mint> fact, finv, inv;
    combination(int n) : fact(n + 1), finv(n + 1), inv(n + 1) {
        fact[0] = fact[1] = finv[0] = finv[1] = inv[1] = 1;
        for (int i : rep(2, n + 1)) {
            fact[i] = fact[i - 1] * i;
            inv[i] = -inv[mint::mod() % i] * (mint::mod() / i);
            finv[i] = finv[i - 1] * inv[i];
        }
    }
    mint P(int n, int r) { return r < 0 || n < r ? 0 : (fact[n] * finv[n - r]); }
    mint C(int n, int r) { return P(n, r) * finv[r]; }
    mint H(int n, int r) { return C(n + r - 1, r); }
    mint catalan(int n) { return C(2 * n, n) / (n + 1); }
};

int main() {
    ll h, w, n;
    cin >> h >> w >> n;
    vector c(h, vll(w));
    for (ll i : rep(h)) {
        for (ll j : rep(w)) cin >> c[i][j];
    }
    vector dp(h, vll(w, -1));
    auto rec = [&](auto rec, ll y, ll x) -> ll {
        if (dp[y][x] != -1) return dp[y][x];
        ll lb = 1;
        for (ll k : rep(4)) {
            ll ny = y + DY[k], nx = x + DX[k];
            if (ny < 0 || ny >= h || nx < 0 || nx >= w) continue;
            if (c[y][x] < c[ny][nx]) chmax(lb, rec(rec, ny, nx) + 1);
        }
        return dp[y][x] = lb;
    };
    ll ans = 0;
    for (ll i : rep(h)) {
        for (ll j : rep(w)) rec(rec, i, j), chmax(ans, dp[i][j]);
    }
    cout << ans << endl;
}