typedef long long ll;
typedef long double ld;

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

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