function hallDance(L, W, A,) {
    L = Number(L);
    W = Number(W);
    A = Number(A);
    A = 200
    dancersarea = 40
    dancersmovment = 7000

    let hall = (L * 100) * (W * 100);
    let wardrobe = (A * A);
    let bench = hall / 10;
    let freeSpace = hall - wardrobe - bench;
    let dancers = freeSpace / (dancersarea + dancersmovment);
    console.log(`${dancers.toFixed(0)}`)
}
hallDance("50", "25", "2");