#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    int a,count=0;arr2;
    cin>>a;
    float arr[a],sum=0;
    for(int i=0;i<a;i++){
        if(cin>>arr[i]){
            count+=1;
            sum+=arr[i];
        }
        else{
            break;
        }
    }
    if(count!=a){
        cout<<"Incomplete Data";
        return 0;
    }
    for(int i=0;i<a;i++){
        i(arr[i]<0){
            cout<<"Invalid Rainfall";
            return 0;
        }
    }
    cout<<fixed<<setprecision(2)<<sum;
    
}