#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define all(a) begin(a),end(a)
#define sz(a) (int)(a).size()
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pii;
const ll mod=998244353;
int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
	int N,M;cin>>N>>M;
	int ans=0;
	while(N--){
		string S;cin>>S;
		ll x=0,y=0;
		stack<pii>st;
		rep(i,0,sz(S)){
			ll _x=x,_y=y;
			if(S[i]=='L')x--;
			else if(S[i]=='R')x++;
			else if(S[i]=='U')y++;
			else y--;
			if(y==0&&_y==1){
				if(x==0)st.emplace(pii(0,-1));
				else if(x<0)st.emplace(pii(-1,-1));
				else st.emplace(pii(1,-1));
			}
			else if(y==1&&_y==0){
				if(x==0)st.emplace(pii(0,1));
				else if(x<0)st.emplace(pii(-1,1));
				else st.emplace(pii(1,1));
			}
			while(sz(st)>1){
				auto u=st.top();st.pop();
				auto v=st.top();
				if(u.first==v.first)st.pop();
				else{st.emplace(u);break;}
			}
		}
		if(!sz(st))ans++;
	}
	cout<<ans<<endl;
}