def gates(n, sup, dem, day):
    if sup > dem:
        sol = n // 4
    else:
        dif = dem - sup
        nb = dif // 50
        if nb >= n:
            sol = n
        elif nb > n/2:
            sol = n//2
        else:
            sol = n//3
    if day == 'sat' or day == 'sun':
        sol -= 2
    if sol < 1:
        sol = 1
    return sol