#include <bits/stdc++.h>
using namespace std;
using ll = long long;

void solve(){
    int N; cin>>N;
    long double sum=0;
    for(int i=0;i<N;++i){
        long double x; cin>>x;
        sum+=x;
    }
    cout<<fixed<<setprecision(12)<<sum;
}
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t=1; //cin>>t;
    for(;t--;) solve();
}