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#include<fstream>
#define NMax 10007
using namespace std;
ifstream fin("litere.in");
ofstream fout("litere.out");
int N,Sol;
char S[NMax];
int Frecv[30];
int Numara(int x)
{
int Nr=0;
for(int i=x+1;i<=26;++i)
Nr+=Frecv[i];
return Nr;
}
int main()
{
fin>>N>>S;
for(int i=0;i<N;++i)
{
Sol+=Numara(S[i]-'a');
Frecv[S[i]-'a']++;
}
fout<<Sol<<"\n";
fin.close();
fout.close();
return 0;
}