// editor2
#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

int main()
{
    int n;
    cin >> n;
    
    if(!(n>=1 && n<=100))
    {
        cout << "Incomplete Data";
        return 0;
    }
    
    bool in = false;
    float data;
    
    vector <float> v;
    for(int i=0;i<n;i++)
    {
        
        if(!cin >> data)
        {
            cout << "Incomplete Data";
            return 0;
        }
        if(!(data>=0 && data<=10000))
        {
            in = true;
        }
        v.push_back(data);
    }
    
    if(in)
    {
        cout << "Invalid Rainfall";
        return 0;
    }
    else
    {
        float sum = 0.0;
        for(float i:v)
        {
            sum += i;
        }
        
        cout << fixed << setprecision(2) << sum << endl;
        return 0;
    }
}