题解

#include<iostream>
#include<cmath>
using namespace std;
int main(){
    int n;
    double cost = 0 ,x = 0 ,sum = 0;
    cin >> n;
    for(int i = 1 ; i <= n ; i++){
        cin >> x;
        sum += ceil (x / 70);  //每70个字一条短信分割加次数
    }
    printf("%.1f" ,sum / 10);
    return 0;
}