#include <iostream>

enum State
{
    None = -1,
    Field,
    Lake,
    Lake_Check,
};

bool ChechLake(short x, short y, char *s, const int *h, const int *w)
{
    if(s[x + y * (*w)] != (char)State::Lake)
        return false;
    
    s[x + y * (*w)] = (char)State::Lake_Check;
    
    
    if(x < ((*w) - 1))
        ChechLake(x + 1, y, s, h, w);
    
    if(x > 0)
        ChechLake(x - 1, y, s, h, w);
    
    if(y < ((*h) - 1))
        ChechLake(x, y + 1, s, h, w);
    
    if(y > 0)
        ChechLake(x, y - 1, s, h, w);
    
    return true;
}


int main()
{
    int h, w;
    std::cin >> h >> w;
    
    char *s = new char[h * w];
    for(int i = 0; i < (h * w); i++)
    {
        int a;
        std::cin >> a;
        s[i] = (char)a;
    }
    
    int count = 0;
    for(short y = 0; y < h; y++)
    {
        for(short x = 0; x < w; x++)
        {
            if(ChechLake(x, y, s, &h, &w))
                count++;
        }
    }
    
    std::cout << count << std::endl;
    
    delete[] s;
    
    return 0;
}