from sys import stdin, stdout input = lambda: stdin.readline().rstrip() write = stdout.write def main(): H, W = map(int, input().split()) A = stdin.read().replace(' ', '').splitlines() ans = 0 for s in A: ans += ponds(s) for i in range(H - 1): n = int(A[i], 2) & int(A[i+1], 2) ans -= ponds(format(n, 'b')) print(ans) def ponds(s): s = s.replace('0', ' ') cnt = len(s.split()) return cnt main()