#include<bits/stdc++.h>
using namespace std;

int main(){
	int N;
	cin >> N;
	string s;
	cin >> s;
	int count = 1;
	for(int i=1;i<N;i++){
		if(s[i] != s[i-1]){
			count++;
		}
	}
	cout << count << endl;
}