import java.util.Arrays;
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
int res = 0;
int last = -1;
while(n-->0) {
int a = scanner.nextInt();
if(a != last) {
res++;last = a;
}
}
System.out.println(res);
}
}
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