#include<bits/stdc++.h>
#include <math.h>
#include <algorithm>
#include <iostream>
#include <vector>
#include <atcoder/all>
#include <atcoder/dsu>
#include <atcoder/segtree>
#include <atcoder/lazysegtree>
#include <atcoder/modint>
#include <atcoder/scc>
#include <chrono>
#include <random>
#include <cassert>
#ifndef templete
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()

//#include<boost/multiprecision/cpp_int.hpp>
//using namespace boost::multiprecision;
using namespace std;
using namespace atcoder;
//using atmint = modint998244353;
using atmint = modint;
using Graph = vector<vector<int>>;
using P = pair<long long,long long>;
//#pragma GCC optimize ("-O3")
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
typedef long long ll; const int inf = INT_MAX / 2; const ll infl = 1LL << 60;
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }

//---------------------------------------------------------------------------------------------------

template<int MOD> struct ModInt {
    static const int Mod = MOD; unsigned x; ModInt() : x(0) { }
    ModInt(signed sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    ModInt(signed long long sig) { x = sig < 0 ? sig % MOD + MOD : sig % MOD; }
    int get() const { return (int)x; }
    ModInt &operator+=(ModInt that) { if ((x += that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator-=(ModInt that) { if ((x += MOD - that.x) >= MOD) x -= MOD; return *this; }
    ModInt &operator*=(ModInt that) { x = (unsigned long long)x * that.x % MOD; return *this; }
    ModInt &operator/=(ModInt that) { return *this *= that.inverse(); }
    ModInt operator+(ModInt that) const { return ModInt(*this) += that; }
    ModInt operator-(ModInt that) const { return ModInt(*this) -= that; }
    ModInt operator*(ModInt that) const { return ModInt(*this) *= that; }
    ModInt operator/(ModInt that) const { return ModInt(*this) /= that; }
    ModInt inverse() const { long long a = x, b = MOD, u = 1, v = 0;
        while (b) { long long t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); }
        return ModInt(u); }
    bool operator==(ModInt that) const { return x == that.x; }
    bool operator!=(ModInt that) const { return x != that.x; }
    ModInt operator-() const { ModInt t; t.x = x == 0 ? 0 : Mod - x; return t; }
};
template<int MOD> ostream& operator<<(ostream& st, const ModInt<MOD> a) { st << a.get(); return st; };
template<int MOD> ModInt<MOD> operator^(ModInt<MOD> a, unsigned long long k) {
    ModInt<MOD> r = 1; while (k) { if (k & 1) r *= a; a *= a; k >>= 1; } return r; }
template<typename T, int FAC_MAX> struct Comb { vector<T> fac, ifac;
    Comb(){fac.resize(FAC_MAX,1);ifac.resize(FAC_MAX,1);rep(i,1,FAC_MAX)fac[i]=fac[i-1]*i;
        ifac[FAC_MAX-1]=T(1)/fac[FAC_MAX-1];rrep(i,FAC_MAX-2,1)ifac[i]=ifac[i+1]*T(i+1);}
    T aPb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b]; }
    T aCb(int a, int b) { if (b < 0 || a < b) return T(0); return fac[a] * ifac[a - b] * ifac[b]; }
    T nHk(int n, int k) { if (n == 0 && k == 0) return T(1); if (n <= 0 || k < 0) return 0;
        return aCb(n + k - 1, k); } // nHk = (n+k-1)Ck : n is separator
    T pairCombination(int n) {if(n%2==1)return T(0);return fac[n]*ifac[n/2]/(T(2)^(n/2));}
    // combination of paris for n com.aCb(h+w-2,h-1);
}; 
//typedef ModInt<1000000007> mint;
typedef ModInt<998244353> mint; 
//typedef ModInt<1000000000> mint; 
Comb<mint, 2010101> com;
//vector dp(n+1,vector(n+1,vector<ll>(n+1,0)));
//vector dp(n+1,vector<ll>(n+1,0));
  std::random_device seed_gen;
  std::mt19937 engine(seed_gen());
string ye = "Yes"; string no = "No"; string draw = "Draw";

#endif // templete
//---------------------------------------------------------------------------------------------------
ll w,h;
vector<vector<ll>>m;
vector<ll>di = {0,1,0,-1};
vector<ll>dj = {1,0,-1,0};
vector<ll>dir_v = {0,1,2,3};

bool ng(vector<ll>a){
    set<ll>st;
    rep(i,0,3)st.insert(a[i]);
    if(st.size() != 3)return true;
    if(a[1] == *st.begin() || a[1] == *st.rbegin()){
    return false;
    }
    return true;
}
void _main() {
  ll up,down,r,l;
  up = 3;
  down = 1;
  r = 0;
  l = 2;
  cin >> w >> h;
  m.resize(h);
  rep(i,0,h)m[i].resize(w);
  rep(i,0,h)rep(j,0,w)cin >> m[i][j];
  vector d(h,vector(w,vector<ll>(4,infl)));
  priority_queue<pair<ll,vector<ll>>,vector<pair<ll,vector<ll>>>,greater<pair<ll,vector<ll>>>>q;
  if(m[0][0] != m[1][0]){
  d[1][0][up] = 1;
  q.push({1,{1,0,up}});
  }
  if(m[0][0] != m[0][1]){
  d[0][1][l] = 1;
  q.push({1,{0,1,l}});
  }
  
  while(q.size()){
  ll dist = q.top().first;
  vector<ll>v = q.top().second;
  q.pop();
  ll i = v[0];
  ll j = v[1];
  ll from_dir = v[2];
  ll from_i = i + di[from_dir];  
  ll from_j = j + dj[from_dir];    
  if(d[i][j][from_dir] != dist)continue;
  rep(dir,0,4){
  ll ni = i + di[dir];
  ll nj = j + dj[dir];
  ll ndist = dist + 1;
  ll ndir = (dir + 2) % 4;
  if(ni < 0 || ni >= h || nj < 0 || nj >= w)continue;
  vector<ll>a;
  a.push_back(m[from_i][from_j]);
  a.push_back(m[i][j]);
  a.push_back(m[ni][nj]);
  if(ng(a))continue;
  if(chmin(d[ni][nj][ndir],ndist))q.push({ndist,{ni,nj,ndir}});
  }
  }
  ll ans = infl;
  rep(dir,0,4)chmin(ans,d[h-1][w-1][dir]);
  if(ans == infl)ans = -1;
  cout << ans << endl;

}