#include <iostream>
using namespace std;

int a[102][102];

void fill(int i, int j, int c)
{
    a[i][j] = c;
    if(a[i-1][j] == 1)
      fill(i-1, j, c);
    if(a[i][j+1] == 1)
      fill(i, j+1, c);
    if(a[i+1][j] == 1)
      fill(i+1, j, c);
    if(a[i][j-1] == 1)
      fill(i, j-1, c);
}

int main()
{
    int n, m, c = 0;
    cin >> n >> m;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <=m; j++)
            cin >> a[i][j];
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            if(a[i][j] == 1)
            {
                c++;
                fill(i, j, c + 1);
            }
    cout << c;
    return 0;
}