题解

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
	int n;
	cin>>n;
    double sum=0;
	for(int i=1;i<=n;i++){
		int x;
		cin>>x;
		if(x<=70){
			sum+=0.1;
		}else{
			sum+=0.1*(x/70+1);
		}
	}
	printf("%.1f",sum);
	return 0;
}