n, m = map(int, input().split())
S = [input() for _ in range(n)]

t = "ULDR"
dy = [1, 0, -1, 0]
dx = [0, -1, 0 , 1]
ans = 0
for i in range(n):
    s = S[i]
    x, y = 0, 0
    rot0 = 0
    rot1 = 0
    for j in range(m):
        ind = t.index(s[j])
        nx, ny = x+dx[ind], y+dy[ind]
        if (x, nx) == (0, 1):
            if 1 <= y: rot0 += 1
            else: rot0 -= 1
        if (x, nx) == (1, 0):
            if 1 <= y: rot0 -= 1
            else: rot0 += 1
        if (x, nx) == (-1, 0):
            if 1 <= y: rot1 += 1
            else: rot1 -= 1
        if (x, nx) == (0, -1):
            if 1 <= y: rot0 -= 1
            else: rot0 += 1
        if (y, ny) == (0, 1):
            if x <= -1:
                rot0 += 1
                rot1 += 1
            elif x <= 0:
                rot0 += 1
                rot1 -= 1
            else:
                rot0 -= 1
                rot1 -= 1
        if (y, ny) == (1, 0):
            if x <= -1:
                rot0 -= 1
                rot1 -= 1
            elif x <= 0:
                rot0 -= 1
                rot1 += 1
            else:
                rot0 += 1
                rot1 += 1
        x, y = nx, ny
    if rot0 == rot1 == 0:
        ans += 1
print(ans)