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#include <fstream>
#include <algorithm>
#include <cmath>
using namespace std;
ifstream f("litere.in");
ofstream g("litere.out");
int s,j;bool sortat;
int main()
{int n,i;char a[10001],x;
f>>n;
for(i=1;i<=n;i++)
{
f>>a[i];
}
while(!sortat)
{
sortat=1;
for(i=1;i<n;i++)
{
if(a[i]>a[i+1])
{
swap(a[i],a[i+1]);
s++;sortat=0;
}
}
}
//g<<a[n];
g<<s;
f.close();
g.close();
return 0;
}