This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
string s;
int main()
{
cin>>s;
long long int len = s.length();
if(len %2 == 1)
{
double fir = len/2;
double sec = len/2+1;
double ans = (0+fir-1)*fir/4 + (0+sec-1)*sec / 4;
printf("%.4lf",ans);
}
else
{
double fir = len/2;
double sec = len/2;
double ans = (0+fir-1)*fir/4 + (0+sec-1)*sec / 4;
printf("%.4lf",ans);
}
return 0;
}
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