题解

#include<bits/stdc++.h>
using namespace std;
int n,a;
float sum;
int main()
{
	cout<<fixed<<setprecision(1);
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a;
        if(a<=70)
            sum+=0.1;
        else if(a%70==0)
            sum+=a/70*0.1;
        else
            sum+=a/70*0.1+0.1;
	}
    cout<<sum;
    return 0;
}