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#include <bits/stdc++.h>
using namespace std;
ifstream fin("litere.in");
ofstream fout("litere.out");
int main()
{
int n, aux;
long long cnt=0;
fin >> n;
char v[n];
for(int i=0; i<n; i++) {
fin >> v[i];
for(int j=i-1; j>-1; j--) {
if((int)v[j+1]<(int)v[j]) {
aux=v[j+1];
v[j+1]=v[j];
v[j]=aux;
cnt++;
} else {
break;
}
}
}
fout << cnt;
return 0;
}