#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    float arr[n];
    float total=0;
    for(int i=0;i<n;i++)
    {
        cin>>arr[i];
        if(arr[i]<0)
        {
            cout<<"Invalid Rainfall";
        }
        total+=arr[i];
    }
    cout<<arr[n].length();
}