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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("litere.in");
ofstream fout ("litere.out");
int main()
{
int n,v[10001],c=0,i=0;
char s;
fin>>n;
while (fin>>s){
v[i]=s+'0';
i++;
}
bool sortat;
do
{
sortat=true;
for(int i=0; i<n-1; i++)
if(v[i]>v[i+1])
{
c++;
swap(v[i],v[i+1]);
sortat=false;
}
}
while(!sortat);
fout<<c;
return 0;
}