#include <bits/stdc++.h>

using namespace std;
#define x first
#define y second
typedef pair<int, int> PII;
const int N = 110;
int g[N][N];
int n, m;

int dx[] = {-1, 0, 1, 0}; //上右下左
int dy[] = {0, 1, 0, -1}; //上右下左

int ans;
queue<PII> q;

void bfs() {
    while (q.size()) {
        auto u = q.front();
        q.pop();
        for (int i = 0; i < 4; i++) {
            int tx = u.x + dx[i], ty = u.y + dy[i];
            if (g[tx][ty]) {
                g[tx][ty] = 0;
                q.push({tx, ty});
            }
        }
    }
}
int main() {
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            cin >> g[i][j];

    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (g[i][j]) {
                ans++;
                g[i][j] = 0;
                q.push({i, j});
                bfs();
            }
        }
    }
    printf("%d", ans);
    return 0;
}