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#include <iostream>
using namespace std;
typedef long long ll;
const int inf = 0x3f3f3f3f;
const int maxn = 100000 + 5;
int main() {
    ll x1, y1, x2, y2, x3, y3;
    while(cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3) {
        ll res = 11*((x1-x2)*(y3-y2)-(y1-y2)*(x3-x2));
        if(res < 0) res = -res;
        cout << res << endl;
    }
    return 0;
}