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#include <fstream> #include <iostream> #include <set> using namespace std; int poeini(string s) { int result = 0; for(int i = s.size() - 1; i >= 0; i--) { set<char> st; st.insert(s[i]); if(i - 1 >= 0) st.insert(s[i - 1]); if(i - 2 >= 0) st.insert(s[i - 2]); result += st.size(); } return result; } int main() { ios_base::sync_with_stdio(0); int n; cin >> n; string S; cin >> S; int result = 0; if(n <= 22) { for(int mask = 0; mask < (1 << n); mask++) { string prva = "", vtora = ""; for(int i = 0; i < n; i++) { if(mask & (1 << i)) { prva += S[i]; } else { vtora += S[i]; } } result = max(result, poeini(prva) + poeini(vtora)); } } cout << result << endl; return 0; }
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