#include <iostream>
#include<string>
using namespace std;

int main() {
	int n;cin>>n;
	string s;cin>>s;
	int ans=1;
	for(int i=0;i<n-1;i++){
		if(s[i]!=s[i+1])ans++;
	}
	cout<<ans<<endl;
	return 0;
}
