#include<cstdio>
#include<cstring>
int record[82][52],c;
void dfs(int x,int y){
    record[x][y]=0;
    if(record[x-1][y]!=0)dfs(x-1,y);
    if(record[x+1][y]!=0)dfs(x+1,y);
    if(record[x][y+1]!=0)dfs(x,y+1);
    if(record[x][y-1]!=0)dfs(x,y-1);
}
int main(){
    int i,j,n,m;
    scanf("%d%d",&m,&n);
    memset(record,0,sizeof(record));
    for(i=1;i<=m;i++)for(j=0;j<=n;j++){
        scanf("%c",&c);
        if(j==0)continue;
        else {
            record[i][j]=(int)(c-'0');
        }
    }
    int ans=0;
    for(i=1;i<=m;i++)for(j=1;j<=n;j++){
        if(record[i][j]!=0){
            ans++;
            dfs(i,j);
        }
    }
    printf("%d\n",ans);
    return 0;
}