// yuki 921 ずんだアロー
// 2019.11.9 bal4u

#include <stdio.h>
#include <ctype.h>

int getchar_unlocked(void);
#define gc() getchar()

int in() {   // 非負整数の入力
	int n = 0; int c;
	do c = gc(); while (isspace(c));
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int main()
{
	int p, f, A, N, ans;
	
    N = in();
    ans = 0, p = 0, f = 0;
    while (N--) {
        A = in();
        if (A == p) ans++, f = 1;
        else if (f) p = 0, f = 0;
        else ans++, f = 1;
        p = A;
    }
    printf("%d\n", ans);
	return 0;
}