题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,sum=0;
    double x;
    cin>>n;
    for(int i = 1;i <= n;i++){
        cin>>x;
        sum+=ceil(double(x/70));
    }
    cout<<double(sum*0.1);
    return 0;
}