#include<iostream>
#include<algorithm>
#include<math.h>
#include<set>
#include<vector>
#include<map>
#include<functional>
#include<iomanip>
#include<queue>
#include<random>
#include<numeric>
#include<string>
#include<stack>
#include<cstring>
typedef long long ll;
typedef long double ld;
using namespace std;
ll dx[] = { 0,0,1,-1 };
ll dy[] = { 1,-1,0,0 };

ll gcd(ll a, ll b) {
	if (a<b) { return gcd(b, a); }
	else if (a%b) { return gcd(b, a%b); }
	else { return b; }
}
ll lcm(ll a, ll b) {
	return a / gcd(a, b)*b;
}
int main() {
	ll N;
	cin >> N;
	ld sum=0;
  	for(ll i=0; i<N; i++){
      ld a;
      cin>>a;
      sum+=a;
    }
	cout << fixed << setprecision(10) << sum << endl;
}