Go: package main

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

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

Python: import sys
sys.setrecursionlimit(500000)

def allblue(H, W, C):
    for h in range(H):
        for w in range(W):
            if C[h][w] == 1:
                return (h, w)
    return (-1, -1)

directions = [(0, 1), (0, -1), (1, 1), (1, 0), (1, -1), (-1, -1), (-1, 0), (-1, 1)]
def dfs(h, w, C):
    C[h][w] = 0
    for dh, dw in directions:
        if 0 <= h+dh < H and 0 <= w+dw < W and C[h+dh][w+dw] == 1:
            dfs(h+dh, w+dw, C)

while True:
    W, H = map(int, input().split())
    if W == 0 and H == 0:
        exit()
    C = [list(map(int, input().split())) for i in range(H)]

    ans = 0
    while True:
        h, w = allblue(H, W, C)
        if (h, w) == (-1, -1):
            break
        dfs(h, w, C)
        ans += 1

    print(ans)

Python: import sys
sys.setrecursionlimit(10000)
def search(x,y,m):
    if not(0<=x<len(m[0]) and 0<=y<len(m)) or m[y][x]=='0': return
    m[y][x] = '0'
    for dx,dy in [[-1,-1],[0,-1],[1,-1],[-1,0],[1,0],[-1,1],[0,1],[1,1]]:
        search(x+dx,y+dy,m)
while True:
    w,h = map(int,input().split())
    if w==h==0: break
    m = [input().split() for _ in range(h)]
    c = 0
    for y in range(h):
        for x in range(w):
            if m[y][x]=='1':
                c += 1
                search(x,y,m)
    print(c)

Python: 
if __name__ == "__main__":
    while True:
        w, h = map(int, input().split())
        if w == 0 and h == 0:
            break
        c = []
        for _ in range(h):
            hi = list(map(int, input().split()))
            c.append(hi)
        
        visited = []
        for _ in range(h):
            hi = [False] * w
            visited.append(hi)
        
        st = []
        ans = 0

        for s_row in range(h):
            for s_col in range(w):
                if c[s_row][s_col] != 0 and not visited[s_row][s_col]:
                    st = [(s_row, s_col)]
                    while st:
                        now = st.pop()
                        for i in range(-1, 2):
                            for j in range(-1, 2):
                                if now[0] + i >= 0 and now[0] + i < h and now[1] + j >= 0 and now[1] + j < w and not visited[now[0] + i][now[1] + j] and c[now[0] + i][now[1] + j] != 0:
                                    visited[now[0] + i][now[1] + j] = True
                                    st.append((now[0] + i, now[1] + j))
                    ans += 1
        print(ans)

Python: import sys
sys.setrecursionlimit(1000000)

while(1):
    w, h = map(int, input().split())
    if w == 0 and h == 0:
        break
    else:
        maps = [[-1]*(w+2)] + [([-1] + list(map(int, input().split())) + [-1]) for _ in range(h)] + [[-1]*(w+2)]
        seen = [[True]*(w+2)] + [([True] + [False]*w + [True]) for _ in range(h)] + [[True]*(w+2)]
        dxy = ((-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1))
        
        
        def dfs(y, x):
            seen[y][x] = True
            for i in dxy:
                if seen[y+i[0]][x+i[1]] is False:
                    if maps[y+i[0]][x+i[1]] == 0:
                        seen[y+i[0]][x+i[1]] = True
                    else:
                        dfs(y+i[0], x+i[1])
        
        now = 0
        ans = 0
        while now < w * h:
            y = now // w + 1
            x = now % w + 1
            if seen[y][x] is False:
                if maps[y][x] == 0:
                    seen[y][x] = True
                else:
                    ans += 1
                    dfs(y, x)
            
            now += 1
        
        print(ans)

Python: import sys
sys.setrecursionlimit(10**8)

ans = []

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

    for dx in range(-1, 2):
        for dy in range(-1, 2):
            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

    count = 0

    c = [[] for _ in range(h)]
    for i in range(h):
        if w == 1:
            c[i] = [int(input())]
        else:
            c[i] = list(map(int, input().split()))

    for x in range(h):
        for y in range(w):
            if c[x][y] == 1:
                dfs(x, y)
                count += 1

    ans.append(count)

for i in ans:
    print(i)

Python: import sys
sys.setrecursionlimit(5000)

dx = [1, 0, -1]
dy = [1, 0, -1]

def dfs(area, x, y):
    area[x][y] = 0
    for i in dx:
        for j in dy:
            next_x = x + i
            next_y = y + j
            if area[next_x][next_y] == 1:
                dfs(area, next_x, next_y)

def solver(w, h):
    ans = 0
    area = [[0]*(w+2)]
    for i in range(h):
        area.append([0]+list(map(int, input().split()))+[0])
    area.append([0]*(w+2))

    for i in range(1, h+1):
        for j in range(1, w+1):
            if area[i][j] == 1:
                ans += 1
                dfs(area, i, j)
    return ans

while True:
    w, h = map(int, input().split())
    if w == h == 0:
        break
    print(solver(w, h))

Python: import sys
sys.setrecursionlimit(2500)

def dfs(v):
    y, x = v
    checked[y][x] = 1
    ret = 1
    for dy, dx in directions:
        if y+dy>=h or y+dy<0 or x+dx>=w or x+dx<0:
            continue
        elif Map[y+dy][x+dx]==0:
            continue
        if not checked[y+dy][x+dx]:
            ret +=  dfs((y+dy, x+dx))
    return ret


directions = ((-1, -1), (-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1), (1, 0), (1, 1))
while 1:
    w, h = map(int, input().split())
    if w==0 and h==0:
        break
    Map = [list(map(int, input().split())) for _ in range(h)]
    SUM = sum([sum(l) for l in Map])
    checked = [[0]*w for _ in range(h)]
    ans = 0
    cnt = 0
    for i in range(h):
        for j in range(w):
            if not checked[i][j] and Map[i][j]!=0:
                ans += 1
                cnt += dfs((i, j))
            if cnt==SUM:
                break
    print(ans)