#include <bits/stdc++.h>

using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include <iostream>
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,
        tree_order_statistics_node_update> ordered_set;
#define endl			"\n"
#define ll				long long
#define all(v)			((v).begin()), ((v).end())
#define sz(v)			((int)((v).size()))
#define clr(v, d)		memset(v, d, sizeof(v))
#define rep(i, v)		for(int i=0;i<sz(v);++i)
#define lp(i, n)		for(int i=0;i<(int)(n);++i)
#define lpi(i, j, n)	for(int i=(j);i<(int)(n);++i)
#define lpd(i, j, n)	for(int i=(j);i>=(int)(n);--i)
#define vi				vector <int>
#define vl				vector <ll>
#define ii				pair <ll,ll>
#define vii				vector <ii>
#define ull				unsigned long long
const double PI = 2 * acos(0.0);
void run() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
}
int n;
string s;

int main() {
	run();
	cin >> n;
	cin >> s;
	int ans = 1;
	for (int i = 0; i < n - 1; i++) {
		if (s[i] != s[i + 1])
			ans++;

	}
	cout << ans;
}
