Tecno02.java

import java.io.BufferedInputStream;
import java.io.PrintWriter;

public class Tecno02 {
    public static void main(String[] args) throws Exception {
        PrintWriter pw = new PrintWriter(System.out);
        FastScanner sc = new FastScanner();
        int d = 0, r = 0;

        int f = sc.nextInt();
        StringBuilder allNames = new StringBuilder();
        boolean flag = true;

        while(f-- > 0) {
            String name = sc.nextLine();
            allNames.append(name);
        }

        char[] charsNames = allNames.toString().toCharArray();

        for (char c : charsNames) {
            if (c == 'D' && flag) {
                d++;
                flag = false;
            } else if (c == 'R' && !flag) {
                r++;
                flag = true;
            }
        }

        pw.println(Math.max(d,r));

        pw.close();
    }

    static class FastScanner {
        private final int BS = 1 << 16;
        private final char NC = (char) 0;
        private final byte[] buf = new byte[BS];
        private int bId = 0, size = 0;
        private char c = NC;
        private double cnt = 1;
        private BufferedInputStream in;

        public FastScanner() {
            in = new BufferedInputStream(System.in, BS);
        }

        private char getChar() {
            while (bId == size) {
                try {
                    size = in.read(buf);
                } catch (Exception e) {
                    return NC;
                }
                if (size == -1) return NC;
                bId = 0;
            }
            return (char) buf[bId++];
        }

        public int nextInt() {
            return (int) nextLong();
        }

        public int[] nextInts(int N) {
            int[] res = new int[N];
            for (int i = 0; i < N; i++) {
                res[i] = (int) nextLong();
            }
            return res;
        }

        public long nextLong() {
            cnt = 1;
            boolean neg = false;
            if (c == NC) c = getChar();
            for (; (c < '0' || c > '9'); c = getChar()) {
                if (c == '-') neg = true;
            }
            long res = 0;
            for (; c >= '0' && c <= '9'; c = getChar()) {
                res = (res << 3) + (res << 1) + c - '0';
                cnt *= 10;
            }
            return neg ? -res : res;
        }

        public double nextDouble() {
            double cur = nextLong();
            return c != '.' ? cur : cur + nextLong() / cnt;
        }

        public String nextLine() {
            StringBuilder res = new StringBuilder();
            while (c <= 32) c = getChar();
            while (c != '\n') {
                res.append(c);
                c = getChar();
            }
            return res.toString();
        }

    }
}