#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 = "up right"; // Initial position
 
    for (int i = 0; i < N; i++) {
        string nextPosition = instructions[i];
 
        // Check if either leg needs to move
        if (currentPosition[0] != nextPosition[0]) {
            minMoves++;
        }
        if (currentPosition[1] != nextPosition[1]) {
            minMoves++;
        }
 
        currentPosition = nextPosition;
    }
 
    cout << minMoves << endl;
 
    return 0;
}

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

NgoKZG93bgoKcmlnaHQKCmRvd24KCnVwCgpyaWdodAoKZG93bg==

6

down

right

down

up

right

down