### BUGGY CODE ###

H, W = map(int, input().split())

X = [[0] * W for i in range(H)]
G = [[0,0] for i in range(W*H)] 
L = [[-1] * W for i in range(H)] # Group ID

for i in range(H):
    s = input()
    for j in range(W):
        if (i+j) % 2 == 0:
            if s[j] == "#":
                X[i][j] = 1
        else:
            if s[j] != "#":
                X[i][j] = 1
            
g = -1
for i in range(H):
    for j in range(W):
        if L[i][j] < 0:
            g += 1
            L[i][j] = g
            GGG = [[i,j]]
            post = [[i,j]]
            G[g][(i+j)%2] += 1
            while post:
                pre = post
                post = []
                for ggg in pre:
                    i0, j0 = ggg
                    if i0>0 and L[i0-1][j0] < 0 and X[i0][j0] == X[i0-1][j0]:
                        if [i0-1,j0] not in GGG:
                            post.append([i0-1,j0])
                            GGG.append([i0-1,j0])
                            L[i0-1][j0] = g
                            G[g][(i0+j0+1)%2] += 1
                    if i0<H-1 and L[i0+1][j0] < 0 and X[i0][j0] == X[i0+1][j0]:
                        if [i0+1,j0] not in GGG:
                            post.append([i0+1,j0])
                            GGG.append([i0+1,j0])
                            L[i0+1][j0] = g
                            G[g][(i0+j0+1)%2] += 1
                    if j0>0 and L[i0][j0-1] < 0 and X[i0][j0] == X[i0][j0-1]:
                        if [i0,j0-1] not in GGG:
                            post.append([i0,j0-1])
                            GGG.append([i0,j0-1])
                            L[i0][j0-1] = g
                            G[g][(i0+j0+1)%2] += 1
                    if j0<W-1 and L[i0][j0+1] < 0 and X[i0][j0] == X[i0][j0+1]:
                        if [i0,j0+1] not in GGG:
                            post.append([i0,j0+1])
                            GGG.append([i0,j0+1])
                            L[i0][j0+1] = g
                            G[g][(i0+j0+1)%2] += 1
                        
            # print(GGG)
# print(G)
ans = 0
for t in G:
    aa, bb = t
    ans += aa * bb
    
print(ans)


### FIXED CODE ###

H, W = map(int, input().split())

X = [[0] * W for i in range(H)]
G = [[0,0] for i in range(W*H)] 
L = [[-1] * W for i in range(H)] # Group ID

for i in range(H):
    s = input()
    for j in range(W):
        if (i+j) % 2 == 0:
            if s[j] == "#":
                X[i][j] = 1
        else:
            if s[j] != "#":
                X[i][j] = 1



g = -1
for i in range(H):
    for j in range(W):
        if L[i][j] < 0:
            g += 1
            L[i][j] = g
            post = [[i,j]]
            G[g][(i+j)%2] += 1
            while post:
                pre = post
                post = []
                for ggg in pre:
                    i0, j0 = ggg
                    if i0>0 and L[i0-1][j0] < 0 and X[i0][j0] == X[i0-1][j0]:
                        post.append([i0-1,j0])
                        L[i0-1][j0] = g
                        G[g][(i0+j0+1)%2] += 1
                    if i0<H-1 and L[i0+1][j0] < 0 and X[i0][j0] == X[i0+1][j0]:
                        post.append([i0+1,j0])
                        L[i0+1][j0] = g
                        G[g][(i0+j0+1)%2] += 1
                    if j0>0 and L[i0][j0-1] < 0 and X[i0][j0] == X[i0][j0-1]:
                        post.append([i0,j0-1])
                        L[i0][j0-1] = g
                        G[g][(i0+j0+1)%2] += 1
                    if j0<W-1 and L[i0][j0+1] < 0 and X[i0][j0] == X[i0][j0+1]:
                        post.append([i0,j0+1])
                        L[i0][j0+1] = g
                        G[g][(i0+j0+1)%2] += 1
                        
            # print(GGG)
# print(G)
ans = 0
for t in G:
    aa, bb = t
    ans += aa * bb
    
print(ans)