01.Birthday

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

int main()
{
    int length;
    int width;
    int height;
    double percents_input;

    cin >> length >> width >> height >> percents_input;

    int volume = length * width * height;
    double liters = volume * 0.001;
    double percents = percents_input * 0.01;
    double total_liters = liters * (1 - percents);

    cout << fixed << setprecision(3) << total_liters << endl;

    return 0;
}