using namespace std ;
int n , m ;
int pd [99] [99] ;
char a [99] [99] ;
void dick ( int x , int y )
{
	if ( pd [x + 1] [y] ) 
	{
	pd [x + 1] [y] = 0 ;
	dick ( x + 1 , y ) ;	
	}
	if ( pd [x - 1] [y] ) 
	{
	pd [x - 1] [y] = 0 ;
	dick ( x - 1 , y ) ;	
	}
	if ( pd [x - 1] [y] ) 
	{
	pd [x] [y - 1] = 0 ;
	dick ( x , y - 1 ) ;	
	}
	if ( pd [x] [y + 1] ) 
	{
	pd [x] [y + 1] = 0 ;
	dick ( x , y + 1  ) ;	
	}
}
int main () 
{
	cin >> n >> m ;
	for ( int i = 1 ; i <= n ; ++i )
	{
		for ( int j = 1 ; j <= m ; ++j )
		{
			cin >> a [i] [j] ;
			if ( a [i] [j] != '0')
			{ 
				pd [i] [j] = 1 ;
			}
		}
	}
	int ans = 0;
	for ( int i = 1 ; i <= n ; ++i )
	{
		for ( int j = 1 ; j <= m ; ++j )
		{
			if ( pd [i] [j] ){
				dick ( i , j );
				++ans;
			}
		}
	}
	cout << ans ;
	return 0 ;
}
/*
4 10
0234500067
1034560500
2045600671
0000000089
*/