HW=input()
HW=HW.rstrip().split(" ")
H=int(HW[0])
W=int(HW[1])

list1=[]
list1.append([2]*(W+2))

for i in range(H):
    list2=[2]
    line=input()
    line=line.rstrip().split(" ")
    for j in range(W):
        list2.append(int(line[j]))
    list2.append(2)
    list1.append(list2)
list1.append([2]*(W+2))
    
#print(list1)

count=0
box=[]
for k in range(1,H+1):
    
    for l in range(1,W+1):
        
        if list1[k][l]==1:
            count=count+1
            list1[k][l]=3
            if list1[k][l+1]==1:
                box.append([k,l+1])
            if list1[k][l-1]==1:
                box.append([k,l-1])
            if list1[k+1][l]==1:
                box.append([k+1,l])
            if list1[k-1][l]==1:
                box.append([k-1,l])
            if len(box)==0:
                pass
            else:
                for n in range(H*W):
                    list1[box[0][0]][box[0][1]]=3
                    if list1[box[0][0]][box[0][1]+1]==1:
                        box.append([box[0][0],box[0][1]+1])
                    if list1[box[0][0]][box[0][1]-1]==1:
                        box.append([box[0][0],box[0][1]-1])
                    if list1[box[0][0]+1][box[0][1]]==1:
                        box.append([box[0][0]+1,box[0][1]])
                    if list1[box[0][0]-1][box[0][1]]==1:
                        box.append([box[0][0]-1,box[0][1]])
                    box.pop(0)
                    if len(box)==0:
                        break
                    else:
                        n+=1
        else:
            l+=1
#print(list1)
print(count)