I=input
N,M=map(int,I().split())
a=x=y=0
D="URDL"
E="DLUR"
F=[[0,2],[2,0],[0,-2],[-2,0]]
v=[-M,M]
G=[[v,[2,2]],[[0,2],v],[v,[0,0]],[[-2,0],v]]
for i in range(N):
	C=[0]
	for c in I():
		for d,e,f,g in zip(D,E,F,G):
			if c==d:
				x+=f[0];y+=f[1]
				if g[0][0]<=x<=g[0][1]and g[1][0]<=y<=g[1][1]:
					if C[-1]==e:C.pop()
					else:C+=[c]
	a+=len(C)<2
print(a)