#include <algorithm>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

using namespace std;

typedef long long ll;

#define MOD 1000000007

int h, w;
vector<vector<int> > a(3000, vector<int>(3000));

void dfs(int y, int x) {
  a[y][x] = 2;
  for (int i = -1; i <= 1; ++i) {
    for (int j = -1; j <= 1; ++j) {
      if (i * i + j * j == 1) {
        int ny = y + i, nx = x + j;
        if (0 <= ny && ny < h && 0 <= nx && nx < w) {
          if (a[ny][nx] == 1) {
            dfs(ny, nx);
          }
        }
      }
    }
  }
}

int main() {
  cin >> h >> w;
  for (int i = 0; i < h; ++i) {
    for (int j = 0; j < w; ++j) {
      cin >> a[i][j];
    }
  }
  int ans = 0;
  for (int i = 0; i < h; ++i) {
    for (int j = 0; j < w; ++j) {
      if (a[i][j] == 1) {
        ans++;
        dfs(i, j);
      }
    }
  }
  cout << ans << endl;
  return 0;
}