#include <bits/stdc++.h>
using namespace std;
#define print(l) for(auto i:l) cout<<i<<" ";cout<<endl;
#define input(t,l,n) vector<t>l(n);for(int i = 0;i<n;i++)cin>>l[i];
#define int long long
#define pb push_back
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define all(l) l.begin(),l.end()
#define pii pair<int,int>
#define fi first
#define se second
const int M = 1e9+7;
const int inf = 1e18;
int bp(int x, int y, int p){
int res = 1;
x = x % p;
while (y > 0) {
if (y & 1)
res = (res * x) % p;
y = y >> 1;
x = (x * x) % p;
}
return res;
}
int MI(int n, int p){
return bp(n, p - 2, p);
}
int mul(int x,int y, int p){
return x * 1ull * y % p;
}
int di(int x,int y, int p){
return mul(x, MI(y, p), p);
}
int n , m , k , q;
void solve(int testcase_number){
cin>>n;
string s,a;
cin>>s;
vector<string>com;
char ii = s[0];
int i =0 ;
while(i<n){
while(s[i] == ii){
a+=s[i];
i++;
}
com.pb(a);
ii = s[i];
a = "";
}
string m1,m2;
for(auto i:com){
int c =0 ;
for(int j = 0;j<((i.size()+1)/2);j++){
m1+=i[0];
c++;
}
while(c<i.size()){
m2+=i[0];
c++;
}
}
char k = m1[0];
m1 = k+m1;
m1 = k+m1;
k = m2[0];
m2 = k+m2;
m2 = k+m2;
// string tp = to_string(m1[0]+m1[0]+m1);
// cout<<m1<<endl;
int ans = 0;
for(int i = 2;i<m1.size();i++){
if(m1[i] == m1[i-1] and m1[i-2] == m1[i-1]){
ans++;
}
else if(m1[i]!= m1[i-1] and m1[i-1]!= m1[i-2] and m1[i-2] != m1[i]){
ans+=3;
}
else{
ans+=2;
}
}
m1 = m2;
for(int i = 2;i<m1.size();i++){
if(m1[i] == m1[i-1] and m1[i-2] == m1[i-1]){
ans++;
}
else if(m1[i]!= m1[i-1] and m1[i-1]!= m1[i-2] and m1[i-2] != m1[i]){
ans+=3;
}
else{
ans+=2;
}
}
cout<<ans<<endl;
}
signed main(){
// ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
// cin.tie(0), cout.tie(0);
// cout << fixed<<setprecision(9);
int t = 1;
// cin>>t;
for(int i = 1;i<=t;i++){
solve(i);
}
}
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