from collections import deque

r, c = map(int, input().split())
lines = []
for i in range(r):
    lines.append(input())

st = None
for i in range(r):
    for j in range(c):
        if lines[i][j] != '.':
            st = (i + j + (lines[i][j] == '\\')) % 2
            break
    if st != None:
        break

o = 0
exposed = {}
q = deque()
for i in range(1,r):
    for j in range((i%2)+st,c,2):
        q.append((i,j))
        E = False
        visited = {}
        while len(q) > 0:
            a, b = q.pop()
            if (a,b) in visited:
                continue
            visited[a,b] = 0
            if (a,b) in exposed:
                E = True
                q.clear()
                break
            if a <= 0 or a >= r or b <= 0 or b >= c:
                E = True
                q.clear()
                break
            if lines[a-1][b-1]=='.':
                q.append((a-1,b-1))
            if lines[a][b-1]=='.':
                q.append((a+1,b-1))
            if lines[a-1][b]=='.':
                q.append((a-1,b+1))
            if lines[a][b]=='.':
                q.append((a+1,b+1))
        if not E:
            o += 1
            for v in q:
                visited[v]=0
        q.clear()
        for k in visited:
            exposed[k]=0
print(o)