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#include <bits/stdc++.h>
#define ll long long int
//"\n"
using namespace std;
string nume="litere";
ifstream fin(nume+".in");
ofstream fout(nume+".out");
int a[10005];
int main()
{
int n;
fin>>n;
for(int i=1;i<=n;i++)
{
char c;
fin>>c;
a[i]=int(c);
}
int cnt=0;
for(int i=1;i<=n;i++)
{
for(int j=i+1;j<=n;j++)
if(a[i]>a[j])++cnt;
}
fout<<cnt;
}