#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
    double ax, ay, az, bx, by, bz, cx, cy, cz, V, V1;
    cin >> ax >> ay >> az >> bx >> by >> bz >> cx >> cy >> cz; //Ввод координат векторов.
    V = (ax*((by*cz)+(cy*bz)))-ay*((bx*cz)+(cx*bz))+az*((bx*cy)+(cx*by)); //Вычисление объёма.
    cout << abs(V); //Выводим модуль значения определителя.
    return 0;
}

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MCAwIDEgMCAxIDAgMSAxIDE=

0 0 1 0 1 0 1 1 1