#ifdef LOCAL
    #define _GLIBCXX_DEBUG
    #define __clock__
#else
    #pragma GCC optimize("Ofast")
#endif
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using VI = vector<ll>;
using VV = vector<VI>;
using VS = vector<string>;
using PII = pair<ll, ll>;

// tourist set
template <typename A, typename B>
string to_string(pair<A, B> p);

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);

string to_string(const string& s) {
  return '"' + s + '"';
}

string to_string(const char* s) {
  return to_string((string) s);
}

string to_string(bool b) {
  return (b ? "true" : "false");
}

string to_string(vector<bool> v) {
  bool first = true;
  string res = "{";
  for (int i = 0; i < static_cast<int>(v.size()); i++) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(v[i]);
  }
  res += "}";
  return res;
}

template <size_t N>
string to_string(bitset<N> v) {
  string res = "";
  for (size_t i = 0; i < N; i++) {
    res += static_cast<char>('0' + v[i]);
  }
  return res;
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p) {
  return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

void debug_out() { cerr << '\n'; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif
// tourist set end

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; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i,b) FOR(i, 0, b)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<'\n'
#define p2(s, t) cout << (s) << " " << (t) << '\n'
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << '\n'
#define SZ(x) ((int)(x).size())
#define SORT(A) sort(ALL(A))
#define RSORT(A) sort(ALL(A), greater<ll>())
#define MP make_pair
#define p_yes() p("Yes")
#define p_no() p("No")

ll SUM(VI& V){
  return accumulate(ALL(V), 0LL);
}

ll MIN(VI& V){return *min_element(ALL(V));}
ll MAX(VI& V){return *max_element(ALL(V));}

void print_vector(VI& V){
  ll n = V.size();
  rep(i, n){
    if(i) cout << ' ';
    cout << V[i];
  }
  cout << endl;
}

ll gcd(ll a,ll b){
    if(b == 0) return a;
    return gcd(b,a%b);
}

ll lcm(ll a,ll b){
    ll g = gcd(a,b);
    return a / g * b;
}

// long double
using ld = long double;
#define EPS (1e-14)
#define equals(a,b) (fabs((a)-(b)) < EPS)

void no(){p_no(); exit(0);}
void yes(){p_yes(); exit(0);}

const ll mod = 1e9 + 7;
const ll inf = 1e18;
const double PI = acos(-1);

ll A[305][305];

struct WarshallFloyd{
  VV d;
  ll N;
  WarshallFloyd(ll n){
    N = n;
    d.resize(N, VI(N, inf));
    rep(i, N) d[i][i] = 0;
  }
  // 双方向
  void register_edge2(ll a, ll b, ll c){
    d[a][b] = c;
    d[b][a] = c;
  }
  void calc(){
    rep(i, N){ // 経由点
      rep(j, N){ // 始点
         rep(k, N){ // 終点
          d[j][k] = min(d[j][k], d[j][i] + d[i][k]);
        }
      }
    }
  }
  ll distance(ll a, ll b){
    return d[a][b];
  }
};

struct UnionFind{
    vector<ll> parent;
    UnionFind(ll sz){
        parent.resize(sz);
        reset();
    }

    void reset(){
        FOR(i, 0, parent.size()){
            parent[i] = i;
        }
    }

    void unite(ll a, ll b){
        if(a>b){
            swap(a, b);
        }
        ll rootA = findRoot(a);
        ll rootB = findRoot(b);
        if(rootA>rootB){
            swap(rootA, rootB);
        }
        if(rootA==rootB){
            return;
        }else{
            // 小さい方を親にする
            parent[rootB] = rootA;
        }
    }

    ll findRoot(ll a){
        if(parent[a]==a){
            return a;
        }else{
            return parent[a] = findRoot(parent[a]);
        }
    }

    map<ll, vector<ll> > getGroups(){
        map<ll, vector<ll> > G;
        FOR(i, 0, parent.size()){
            ll r = findRoot(i);
            G[r].push_back(i);
        }
        return G;
    }

    bool is_same_group(ll a, ll b){
        ll rootA = findRoot(a);
        ll rootB = findRoot(b);
        if(rootA==rootB){
            return true;
        }else{
            return false;
        }
    }
};

struct Edge{
    ll from;
    ll to;
    ll cost;
    Edge(ll from, ll to, ll cost): from(from), to(to), cost(cost) {}
    bool operator<(const Edge &another) const
    {
        return cost < another.cost;
    }
    bool operator>(const Edge &another) const
    {
        return cost > another.cost;
    }
};

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

    // input
    ll N; 
    cin>>N;

    rep(i,N){
      rep(j,N){
        cin>>A[i][j];
      }
    }

    WarshallFloyd wa(N);
    rep(i,N){
      rep(j,N){
        wa.register_edge2(i,j,A[i][j]);
      }
    }
    wa.calc();

    bool ok=true;
    rep(i,N){
      rep(j,N){
        if(wa.distance(i,j) != A[i][j]) ok=false;
      }
    }

    if(!ok){
      p(-1); return 0;
    }

    ll sum = 0;
    rep(i,N){
      FOR(j,i+1,N){
        sum += A[i][j];
      }
    }
    debug(sum);

    rep(i,N){
      FOR(j,i+1,N){
        rep(k,N){
          if(i==k) continue;
          if(j==k) continue;
          // k 経由点
          if(A[i][j] == A[i][k]+A[k][j]){
            // i,jの直接の道、いらない
            sum -= A[i][j];
            break;
          }
        }
      }
    }
    p(sum);

    // 最小全域木
    // auto uf = UnionFind(N);
    // // コストの小さい順に取り出す設定
    // priority_queue<Edge, vector<Edge>, greater<Edge> > que;
    // rep(i,N){
    //   rep(j,N){
    //     que.push(Edge(i,j,A[i][j]));
    //   }
    // }
    // ll sum = 0;
    // while(!que.empty()){
    //     auto edge = que.top();
    //     que.pop();
    //     ll fr = edge.from;
    //     ll to = edge.to;
    //     if(!uf.is_same_group(fr, to)){
    //         uf.unite(fr, to);
    //         sum += edge.cost;
    //     }
    // }
    // p(sum);
    
    return 0;
}

Measured memory_bytes: 1664