#include <iostream>
#include <vector>
#include <string>
 
using namespace std;
 
int main() {
    int N;
    cin >> N;
 
    vector<string> instructions(N);
    for (int i = 0; i < N; i++) {
        cin >> instructions[i];
    }
 
    int minMoves = 0;
    string currentPosition = "down right"; // Initial position
 
    for (int i = 0; i < N; i++) {
        string nextPosition = instructions[i];
 
        // Check if a move is necessary for each leg
        if (currentPosition.find(nextPosition) == string::npos) {
            minMoves++;
            currentPosition = nextPosition + (currentPosition[1] != nextPosition[0] ? currentPosition[1] : nextPosition[0]);
        }
    }
 
    cout << minMoves << endl;
 
    return 0;
}

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NgoKZG93bgoKcmlnaHQKCmRvd24KCnVwCgpyaWdodAoKZG93bg==

6

down

right

down

up

right

down