#include<iomanip>
#include<iostream>
using namespace std;
long double ans,tmp;
int main()
{
	double x,sum=0;
	cin>>x;
	sum+=x;
	while(getchar()!='\n')
    {
        cin>>x;
        sum+=x;
    }
    cout<<fixed<<setprecision(5)<<sum;
	return 0;
}