#include <bits/stdc++.h>
#include<atcoder/all>
using namespace atcoder;
using namespace std;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll mod=998244353;
ll inf=10000000000000000;
int main(){
    map<ll,ll>memo;
    memo[0]=1;
    ll now=0;
    ll n;
    cin >> n;
    string s;
    cin >> s;
    ll ans=1;
    for (ll i = 1; i < n; i++)
    {
        if (s[i]!=s[i-1])
        {
            ans++;
        }
        
    }
    cout << ans << endl;
}