题解

#include<bits/stdc++.h>
#define ll long long                                                                  //防抄袭标记
#define MAXN 100005
#define maxn 1000005
#define MAXM 10000005
#define maxm 100000005
using namespace std;
int n,a;
double sum;
int main(){
	cin>>n;
	for(int i = 1;i<=n;i++){
		cin>>a;
		sum+=ceil(a/70.0)*0.1;
//		printf("sum%.1lf\n",sum);
	}
	printf("%.1lf",sum);
	return 0;
}