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#include <fstream>
using namespace std;
ifstream fin("litere.in");
ofstream fout("litere.out");
int main()
{
int n,cont=0;
char N[10005],c;
bool ok=1;
fin>>n;
for(int i=1; i<=n; i++)
{
fin>>N[i];
}
do
{
ok=1;
for(int i=1; i<n; i++)
if((int)N[i]>(int)N[i+1])
{
swap(N[i],N[i+1]);
ok=0;
cont++;
}
}
while(ok==0);
fout<<cont;
fin.close();
fout.close();
return 0;
}