#include <iostream>
#include <iomanip>
#include "func.h"

using std::cin;
using std::cout;
using std::endl;

int main() {
    int n, m;
    cin >> n >> m;
    MyVector vec;
    vec.Read(n);

    char cmd;
    while (m--) {
        cin >> cmd;
        if (cmd == '+') {
            int index, x;
            cin >> index >> x;
            if (index != 0) {
                vec.Insert(x, index - 1);
            } else {
                vec.PushBack(x);
            }
        } else if (cmd == '-') {
            int index;
            cin >> index;
            if (index != 0) {
                vec.Erase(index - 1);
            } else {
                vec.PopBack();
            }
        } else if (cmd == '?') {
            cin >> cmd;
            if (cmd == '+') {
                cout << vec.Sum();
            } else if (cmd == '/') {
                cout << std::setprecision(4) << std::fixed
                     << vec.Mean();
            } else if (cmd == '<') {
                cout << vec.Min();
            }  else if (cmd == '>') {
                cout << vec.Max();
            }
            cout << endl;
        }
    }
}