use std::io::Read;

fn solve(a: Vec<usize>) {
    let mut cnt: usize = 1;
    let mut continuing: bool = true;
    let mut prev: usize = a[0];
    a.iter().skip(1).for_each(|i| {
        if prev == *i || !continuing {
            cnt += 1;
            continuing = true
        }
        else {
            continuing = false
        }
        prev = *i;
    });
    println!("{}", cnt);
}

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let all_data: Vec<&str> = all_data.trim().split('\n').map(|a| a.trim()).collect();
    let a: Vec<usize> = all_data.iter().skip(1).next().unwrap().split_whitespace().map(|i| i.parse::<usize>().unwrap()).collect();
    solve(a);
}