/** author: shobonvip created: 2025.02.21 23:09:39 **/ #include using namespace std; //* ATCODER #include using namespace atcoder; typedef modint998244353 mint; //*/ /* BOOST MULTIPRECISION #include using namespace boost::multiprecision; //*/ typedef long long ll; #define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++) #define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--) #define all(v) v.begin(), v.end() template bool chmin(T &a, const T &b) { if (a <= b) return false; a = b; return true; } template bool chmax(T &a, const T &b) { if (a >= b) return false; a = b; return true; } template T max(vector &a){ assert(!a.empty()); T ret = a[0]; for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]); return ret; } template T min(vector &a){ assert(!a.empty()); T ret = a[0]; for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]); return ret; } template T sum(vector &a){ T ret = 0; for (int i=0; i<(int)a.size(); i++) ret += a[i]; return ret; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); int n, m; cin >> n >> m; auto check = [&](string s) -> bool { int x = 0; int y = 0; vector r; rep(i,0,m) { if (s[i] == 'L') { if (x == 1) { if (y >= 1) { r.push_back(0); }else{ r.push_back(1); } } if (x == 0) { if (y >= 1) { r.push_back(2); }else{ r.push_back(3); } } x--; }else if(s[i] == 'R') { if (x == 0) { if (y >= 1) { r.push_back(1); }else{ r.push_back(0); } } if (x == -1) { if (y >= 1) { r.push_back(3); }else{ r.push_back(2); } } x++; }else if(s[i] == 'U') { y++; }else if(s[i] == 'D') { y--; } } vector st; rep(i,0,(int)r.size()) { if (!st.empty()) { if ((r[i] ^ 1) == st.back()) { st.pop_back(); continue; } } st.push_back(r[i]); } return st.empty(); }; int ans = 0; rep(i,0,n) { string s; cin >> s; if (!check(s)) continue; ans++; } cout << ans << '\n'; }