#include <iostream>
#include <iomanip>
using namespace std;

class Rainfall {
    private:
    static double total;
    static const int MAX_DAYS = 100;
    
    public:
    static void calculate() {
        int n;
        if (!(cin >> n)) {
            cout << "Incomplete Data";
            return;
        }
        
        if (n < 1 || n > MAX_DAYS) {
            cout << "Incomplete Data";
            return;
        }
        
        total = 0;
        double value;
        
        for (int i = 0; i < n; i++) {
            if !(cin >> value) {
                cout << "Incomplete Data";
                return;
            }
            
            if (value < 0) {
                cout << "Invalid Rainfall";
                return;
            }
            
            total += value;
        }
        
        cout << fixed << setprecision(2) << total;
    }
};

double Rainfall :: total = 0;

int main () {
    Rainfall :: calculate();
    return 0;
}