#include<bits/stdc++.h>
using namespace std;
int n,m,ans;
char a[101][101];
int fx[4]={1,0,-1,0};
int fy[4]={0,1,0,-1};
void dfs(int x,int y)
{
	a[x][y]='0';
	for(int i=0;i<=3;i++)
	{
		int xx=x+fx[i],yy=y+fy[i];
		if(a[xx][yy]!='0'&&xx>=1&&xx<=n&&yy>=1&&yy<=m) dfs(xx,yy);
	}
}
int main(){
	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]!='0'){
				dfs(i,j);
				ans++;
			}
		}
	}
	cout<<ans;
}
/**************************************************************
	Problem: 1907
	User: wuyunfeng
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2352 kb
****************************************************************/