#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
#include<queue>
#include<map>
#include<math.h>
#include<numeric>
#include<utility>
#include<unordered_map> //hash map

#define rep(i,a,n) for(int (i)=(a);(i)<(n);(i)++)
#define rrep(i,a,n) for(int (i)=(a);(i)>=(n);(i)--)

#define INF 1000000000
#define MOD 1000000007

typedef  long long ll;

using namespace std;

template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

double euclid_distance(double a,double b){
    return sqrt(a*a+b*b);
}

ll gcd(ll  a,ll b){
    ll r;
    if(a < b){
        ll tmp;
        tmp = a;
        a = b;
        b = tmp;
    }
    while(r = a % b){
        a = b;
        b = r;
    }
    return b;
}
/*
ll Integer_factorization(ll n){
    ll num = 0;
    ll ndash = n;
    if(n == 1) return 1;
    ll a = 2;
    while(ndash >= a*a){
        if(n % a  == 0){
            count++;
            n/=a;

        if(count % b == 0){
            ans *= a;
        }
        }else{a++;count = 0;}
    }

    return num;
}
*/

ll r_fuct[2000];
ll fuct[2000];

//MOD逆元
void conb(ll n,ll k){
    fuct[0] = 1;
    for(int i = 1;i < k+1;i++){
        fuct[i] *= fuct[i-1]%MOD;
        
        ll b = MOD, u = 1, v = 0;
        ll value = fuct[i];
        while (b) {
            ll t = value / b;
            value -= t * b;
            swap(value, b);
            u -= t * v;
            swap(u, v);
        }
        u %= MOD;
        if (u < 0) u += MOD;
        r_fuct[i] = u;
    }
}

ll factrial(ll n){
    if(n == 0) return 1;
    ll p = factrial(n-1)*n%MOD;
    return p;
}

//MOD逆元
ll farmat(ll n,ll p){    
    if(p == 0) return 1;
    else if(p == 1) return n%MOD;
    ll d = farmat(n,p/2);
    if(p%2 == 0){
        return (d*d)%MOD;
    }else{
        return ((n*d)%MOD*d)%MOD;
    }
}

ll conbination(ll n,ll k){
    ll a = factrial(n);
    ll b = factrial(k);
    ll c = factrial(n-k);
    return (a*farmat(b,MOD-2)%MOD*farmat(c,MOD-2))%MOD;
}

int memo[10000000];

int fib(int i){
    if(i <= 1) return i;
    if(memo[i] != 0) return memo[i];
    return memo[i] = fib(i-1)+fib(i-2);
}

ll dig(ll n){
    ll d = 0;
    while(n != 0){
        n/=10;
        d++;
    }
    return d;
}

void solve() {
    
    /*
    int a,b;
    cin >> a >> b;    
   cout << max(0,a-b*2) << endl;
   */
  /*
  int   n;
  cin >> n;
  int a[n];
  for(int i = 0;i < n;i++){
      cin >> a[i];
  }
  int ans = 0;
  for(int i = 0;i < n;i++){
      for(int j = i+1;j < n;j++){
          ans += a[i]*a[j];
      }
  }
  cout << ans << endl;
  */
 
 int n;
 cin >> n;
 string s;
 cin >> s;
 char cur = s[0];
 int ans = 0;
 bool f = true;
 for(int i = 1;i < n;i++){
      if(cur != s[i]){
        cur = s[i]; 
        if(f) ans+=2; 
        else ans++;
        f = false;
     }
 }
 
 if(f) ans = 1;
 
 cout << ans << endl;
 
 /*
 ll n;
 cin >> n;
 vector<ll>l(n);
 for(int i = 0;i < n;i++){
     cin >> l[i];
 }
 */
 
}




int main() {

	cin.tie(0);
	ios::sync_with_stdio(false);
	solve();
	return 0;
}



Measured memory_bytes: 512