n, m = map(int, input().split())
ans = 0
for _ in range(n):
    s = input()
    d = []
    x = y = 0
    for c in s:
        if c == 'L':
            match (x, y):
                case (0, 0):
                    d.append(0)
                case (0, 1):
                    d.append(1)
                case (0, 1):
                    d.append(2)
                case (1, 1):
                    d.append(3)
            x -= 1
        elif c == 'R':
            x += 1
            match (x, y):
                case (0, 0):
                    d.append(0)
                case (0, 1):
                    d.append(1)
                case (0, 1):
                    d.append(2)
                case (1, 1):
                    d.append(3)
        elif c == 'U':
            y += 1
        else:
            y -= 1
        if len(d) >= 2 and d[-1] == d[-2]:
            d.pop()
            d.pop()
    if len(d) == 0:
        ans += 1
print(ans)