hmi.cpp

#include <algorithm>
#include <iostream>

using namespace std;
#define REP(i, n) for (int i = 0; i < n; i++)

int w, h;
int C[50][50] = {};

void visit(int x, int y) {
  C[x][y] = 0;
  for (int ix = x - 1; ix <= x + 1; ix++) {
    for (int iy = y - 1; iy <= y + 1; iy++) {
      if (ix >= 0 && iy >= 0 && ix < w && iy < h && C[ix][iy] == 1) {
        visit(ix, iy);
      }
    }
  }
}

int main() {
  while (cin >> w >> h, w) {
    int ans = 0;
    C[50][50] = {};
    REP(j, h) {
      REP(i, w) { cin >> C[i][j]; }
    }
    REP(i, w) {
      REP(j, h) {
        if (C[i][j] == 1) {
          ans++;
          visit(i, j);
        }
      }
    }
    cout << ans << endl;
  }
}