#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

typedef long long ll;

const ll X = 1000000 + 10000;
ll fenvals[X + 1];

void update(ll i, ll change) {
    while (i <= X) {
        fenvals[i] += change;
        i |= i + 1;
    }
}

ll psum(ll i) {
    int sum = 0;
    while (i >= 0) {
        sum += fenvals[i];
        i &= i + 1;
        i--;
    }
    return sum;
}

int main() {
    ios::sync_with_stdio(false), cin.tie(0);
    double count = 0;
    while (true) {
        string oper;
        cin >> oper;
        if (oper == "QUIT") {
            break;
        }
        double raw_x;
        cin >> raw_x;
        ll x = floor(100*raw_x + 0.5);
        if (oper == "BID") {
            update(x, 1);
        } else if (oper == "DEL") {
            update(x, -1);
        } else {
            ll k;
            cin >> k;
            count += min(k, psum(X) - psum(x - 1));
        }
    }
    count /= 100;
    cout << fixed << setprecision(2) << count;
}