#include <iostream>
using namespace std;
int main()
{
    double sum=0;//注意sum应当为浮点型
    int n,a[54188];
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        if(a[i]<=60)sum=sum+0.1;
        else sum=sum+0.2;
    }
    cout<<sum;
    return 0;
}