#include<bits/stdc++.h>
using namespace std;

char a[110][110];
bool f[110][110];
int fx[4][2] = {{0,1},{1,0},{0,-1},{-1,0}};
int c,n,m;

void dfs(int x,int y){
	f[x][y] = true;
	int tx,ty;
	for(int i = 0;i < 4;i++){
		tx = x + fx[i][0];
		ty = y + fx[i][1];
		
		if(tx>=1&&tx<=n&&ty>=1&&ty<=m&&a[tx][ty]!='0'&&f[tx][ty]==false){
			dfs(tx,ty);
		}
	}
} 

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'&&f[i][j]==false){
				c++;
				dfs(i,j);
			}
		}
	}
	
	cout<<c;
}
/**************************************************************
	Problem: 1907
	User: admin
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2344 kb
****************************************************************/