代码\

#include <iostream>
#include <cstring>
#include <cmath> 
#include <iomanip>
using namespace std;
double aa(int n){
	double sum=1;
	while(n--){
		sum=sum/10.0;
	}
	return sum;
}
int main(){
	string a;
	int n=0;
	long long sum=0;
	cin>>a;
	for(int i=0;i<a.length();i++){
		if(i>11){
			break;
		} 
		if(a[i]=='.'){
			continue;
		}
		if(a[i]>='0'&&a[i]<='9'){
			sum=sum*10+(a[i]-'0');
		}
		n++;
	}
	cout<<fixed<<setprecision(8)<<sum*1.0/pow(10,n-1)/23.0;
	return 0;
}