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#include <bits/stdc++.h>
using namespace std;
int v[10005];
ifstream fin("litere.in");
ofstream fout("litere.out");
int main() {
int n, cnt = 0;
char c;
fin >> n;
for(int i = 0; i < n; i++) {
fin >> c;
v[i] = c - 96;
}
for(int i = 1; i < n; i++)
for(int j = 0; j < i; j++)
if(v[j] > v[i])
cnt++;
fout << cnt;
return 0;
}