#include <iostream>

using namespace std;
int main(){
    int n,i=1;
    double s,p,sum=0.0;
    cout << "請輸入學生人數：" << endl;
    cin>>n;
    while(i<=n){
        cout << "請輸入第" << i <<"/" << n <<"學生分數：" << endl;
        cin>>s;
        sum+=s;
        i++;
    }
    p=sum/n;
    cout << "學生人數:" << n << endl;
    cout << "縂分數:" << sum << endl;
    cout<<"平均成績是: " << p << endl;
    return 0;
}