#include<bits/stdc++.h>
using namespace std;
const int MAX=100;
char mp[MAX+5][MAX+5];
int step[MAX+5][MAX+5],n,m;
bool vis[MAX+5][MAX+5];
struct point
{
	int x,y;
};
bool bfs(int x,int y)
{
	queue<point> q;
	if(mp[x][y]!='0'||vis[x][y]) return 0;
	q.push({x,y});
	vis[x][y]=1;
	step[x][y]=0;
	while(!q.empty())
	{
		point t=q.front();
		q.pop();
		point v1={t.x-1,t.y},v2={t.x+1,t.y},v3={t.x,t.y-1},v4={t.x,t.y+1};
		if(v1.x>0&&mp[v1.x][v1.y]!='0'&&!vis[v1.x][v1.y])
		{
			q.push(v1);
			vis[v1.x][v1.y]=1;
		}
		if(v2.x<=n&&mp[v2.x][v2.y]!='0'&&!vis[v2.x][v2.y])
		{
			q.push(v2);
			vis[v2.x][v2.y]=1;
		}
		if(v3.y>0&&mp[v3.x][v3.y]!='0'&&!vis[v3.x][v3.y])
		{
			q.push(v3);
			vis[v3.x][v3.y]=1;
		}
		if(v4.y<=m&&mp[v4.x][v4.y]!='0'&&!vis[v4.x][v4.y])
		{
			q.push(v4);
			vis[v4.x][v4.y]=1;
		}
	}
	return 1;
}
int main()
{
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++) scanf("%c",&mp[i][j]);
		scanf("\n");
	}
	int c=0;
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++) c+=bfs(i,j);
	}
	printf("%d",c);
	return 0;
}