/* -*- coding: utf-8 -*-
 *
 * 2894.cc:  No.2894 Monotonic Intervals - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 500000;

/* typedef */

/* global variables */

char s[MAX_N + 4];

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d%s", &n, s);

  int cnt = 0;
  for (int i = 0; i < n;) {
    int j = i;
    while (i < n && s[j] == s[i]) i++;
    cnt++;
  }

  printf("%d\n", cnt);
  
  return 0;
}