题解

#include<bits/stdc++.h>
using namespace std;
int main()	
{
    int n;
    cin>>n;
    int x;
    double s=0;
    while(n--)
    {
    	cin>>x;
    	s+=ceil(x/70.0)*0.1;
	}
	cout<<s;
    return 0;
}