import std;

void main() {
    int X;
    readf("%d\n", X);

    int[] A = [2, 2, -1, -1, 2, -1, -1];
    auto B = A.cycle(100);

    int res, pos;
    foreach (b; B) {
        pos += b;
        res += b.abs;

        if (pos == X) break;
    }

    res.writeln;
}