vdanger.cpp

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

#define taskname "vdanger"

typedef long long ll;

void ioset() {
  cin.tie(0)->sync_with_stdio(0);
  if (fopen(taskname".in", "r")) {
    freopen(taskname".in", "r", stdin);
    // freopen(taskname".out", "w", stdout);
  }
}

template<typename T>
bool chmin(T &a, T b) {
  return a > b ? a = b, 1 : 0;
}

void solve() {
  int n, m;
  cin >> n >> m;
  vector<int> a(m);
  for (auto &i : a) {
    cin >> i;
    i--;
  }
  vector<vector<int>> danger(n, vector<int>(n));
  for (auto &i : danger) {
    for (auto &j : i) cin >> j;
  }
  for (int k = 0; k < n; k++)
  for (int i = 0; i < n; i++)
  for (int j = 0; j < n; j++) {
    chmin(danger[i][j], danger[i][k] + danger[k][j]);
  }
  int ans = 0;
  for (int i = 1; i < m; i++) {
    ans += danger[a[i - 1]][a[i]];
  }
  cout << ans << '\n';
}

int main() {
  ioset();
  solve();
}