Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0

	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 0
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	for solve(scanner, writer) {

	}
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}

func solve(scanner *bufio.Scanner, writer *bufio.Writer) bool {
	sol := solver{}
	sol.w = getNextInt(scanner)
	sol.h = getNextInt(scanner)
	if sol.w == 0 && sol.h == 0 {
		return false
	}
	sol.land = makeInts(sol.h, sol.w)
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			sol.land[y][x] = getNextInt(scanner)
		}
	}
	ans := 0
	for y := 0; y < sol.h; y++ {
		for x := 0; x < sol.w; x++ {
			if sol.land[y][x] == 0 {
				continue
			}
			ans++
			sol.dfs(y, x)
		}
	}
	fmt.Fprintln(writer, ans)
	return true
}

type solver struct {
	w, h int
	land [][]int
}

func (sol *solver) dfs(y, x int) {
	if y < 0 {
		return
	}
	if y >= sol.h {
		return
	}
	if x < 0 {
		return
	}
	if x >= sol.w {
		return
	}
	if sol.land[y][x] == 0 {
		return
	}
	sol.land[y][x] = 0
	dy := [8]int{-1, -1, -1, 0, 0, 1, 1, 1}
	dx := [8]int{-1, 0, 1, -1, 1, -1, 0, 1}
	for i := 0; i < 8; i++ {
		sol.dfs(y+dy[i], x+dx[i])
	}
}
func makeInts(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

Python: import sys
sys.setrecursionlimit(10 ** 6)
readline = sys.stdin.readline
directions = [(-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1)]

class Ans():

    def __init__(self, H, W, mat):
        self.H = H
        self.W = W
        self.mat = mat
        self.visited = [[False] * W for _ in range(H)]

    def dfs(self, h, w):
        if self.mat[h][w] == 0 or self.visited[h][w] == True:
            return
        
        self.visited[h][w] = True
        for dh, dw in directions:
            if not (0 <= h + dh < self.H and 0 <= w + dw < self.W):
                continue
            if self.mat[h+dh][w+dw] == 0 or self.visited[h+dh][w+dw] == True:
                continue
            self.dfs(h+dh, w+dw)
        return

def main():
    while 1:
        W, H = map(int, readline().rstrip().split())
        if W == H == 0:
            break

        mat = [list(map(int, readline().rstrip().split())) for _ in range(H)]
        ans = Ans(H, W, mat)

        res = 0
        for h in range(H):
            for w in range(W):
                if ans.mat[h][w] == 1 and ans.visited[h][w] == False:
                    res += 1
                ans.dfs(h, w)

        print(res)

if __name__ == '__main__':
    main()

Python: import sys
sys.setrecursionlimit(1000000)
moves = ((1, 0), (-1, 0), (0, 1), (0, -1), (1, 1), (1, -1), (-1, 1), (-1, -1))

def dfs(y, x):
  c[y][x] = 0

  for dy, dx in moves:
    ny = y + dy
    nx = x + dx 
    if 0 <= ny < h and 0 <= nx < w and c[ny][nx] == 1:
      dfs(ny, nx)

while True:
  w, h = map(int, input().split())
  if w == 0 and h == 0:
    break
  c = [list(map(int, input().split())) for _ in range(h)]
  ans = 0
  for i in range(h):
    for j in range(w):
      if c[i][j] == 1:
        dfs(i, j)
        ans += 1
  print(ans)

Python: import sys
sys.setrecursionlimit(100000)


def dfs(h, w):
    checked[h][w] = 1
    for hi in range(-1, 2):
        for wj in range(-1, 2):
            if 0 <= h+hi <= H-1 and 0 <= w+wj <= W-1:
                if hw[h+hi][w+wj] == 1 and checked[h+hi][w+wj] == -1:
                    dfs(h+hi, w+wj)


while True:
    W, H = list(map(int, input().split()))
    if W == 0 and H == 0:
        break

    hw = []
    for _ in range(H):
        tmp = list(map(int, input().split()))
        hw.append(tmp)

    checked = [[-1] * W for i in range(H)]
    ans = 0
    for w in range(W):
        for h in range(H):
            if hw[h][w] == 1 and checked[h][w] == -1:
                ans += 1
                dfs(h, w)
    print(ans)

Python: #AOJ1160
def search(w,h,data):
    for i in range(h):
        if 1 in data[i]:
            return (i,data[i].index(1))
    return (-1,-1)

def main(w,h):
    data=[list(map(int,input().split())) for j in range(h)]
    start=search(w,h,data)
    island=0
    while start!=(-1,-1):
        island+=1
        checking=[start]
        data[start[0]][start[1]]=0
        while len(checking)>0:
            now=checking.pop()
            for j in range(now[0]-1,now[0]+2):
                for k in range(now[1]-1,now[1]+2):
                    if (j,k)!=now and j>=0 and k>=0 and j<h and k<w:
                        if data[j][k]==1:
                            data[j][k]=0
                            checking.append((j,k))
        start=search(w,h,data)
    return island          

w,h=map(int,input().split())
while w!=0 and h!=0:
    print(main(w,h))
    w,h=map(int,input().split())

Python: # -*- coding: utf-8 -*-
def dfs(x,y):
    c[x][y] = 0
    for dx in [-1,0,1]:
        for dy in [-1,0,1]:
            nx = x + dx
            ny = y + dy
            if 0 <= nx < h and 0 <= ny < w and c[nx][ny] == 1:
                dfs(nx, ny)

while True:
    w, h = map(int,input().split())
    if w == 0 and h == 0 :
        break
    
    c = [list(map(int,input().split())) for j in range(h)]
    count = 0
    
    for i in range(h):
        for j in range(w):
            if (c[i][j] == 1):
                dfs(i,j)
                count += 1

    print(count)

Python: # AOJ 1160: How Many Islands?
# Python3 2018.7.15 bal4u

# UNION-FIND library
class UnionSet:
	def __init__(self, nmax):
		self.size = [1]*nmax
		self.id = [i for i in range(nmax+1)]
	def root(self, i):
		while i != self.id[i]:
			self.id[i] = self.id[self.id[i]]
			i = self.id[i]
		return i
	def connected(self, p, q): return self.root(p) == self.root(q)
	def unite(self, p, q):
		i, j = self.root(p), self.root(q)
		if i == j: return
		if self.size[i] < self.size[j]:
			self.id[i] = j
			self.size[j] += self.size[i]
		else:
			self.id[j] = i
			self.size[i] += self.size[j]
# UNION-FIND library

def id(r, c):
	global w
	return r*w+c

mv = [[-1,-1],[-1,0],[-1,1],[0,-1],[0,1],[1,-1],[1,0],[1,1]]

while True:
	w, h = map(int, input().split())
	if w == 0: break
	arr = [[] for r in range(h)]
	u = UnionSet(w*h)
	for r in range(h): arr[r] = list(map(int, input().split()))
	for r in range(h):
		for c in range(w):
			if not arr[r][c]: continue
			for i in range(8):
				r2, c2 = r + mv[i][0], c + mv[i][1]
				if r2 < 0 or r2 >= h or c2 < 0 or c2 >= w or not arr[r2][c2]: continue
				u.unite(id(r, c), id(r2, c2))
	ans = 0
	for r in range(h):
		for c in range(w):
			if arr[r][c] and u.root(id(r, c)) == id(r, c): ans += 1
	print(ans)