# coding utf-8

def Input_func():
    data = input().split(" ")
    return data

def Time_count_func(time, a, b, c, d):
    section_time = 0
    for t in range(time):
        if t % (a + b) < a and t % (c + d) < c:
            section_time += 1
    return section_time


def Calc_func(data):
    a = int(data[0])
    b = int(data[1])
    c = int(data[2])
    d = int(data[3])
    e = int(data[4])

    section_time = 0
    cycle_num = 0
    dive_rem = 0
    answer = 0

    # cycle time
    time = ((a + b) * (d + c))

    # e < cycle time
    if e < time:
        time = e
        answer = Time_count_func(time, a, b, c, d)
    else:
        cycle_num = e // time
        dive_rem = e % time
        section_time = Time_count_func(time, a, b, c, d)
    
    if answer != 0:
        print(answer)
    else:
        answer = section_time * cycle_num
        answer += Time_count_func(dive_rem, a, b, c, d)
        print(answer)



def main():

    # data[0]~[4] is A~E
    data = Input_func()

    Calc_func(data)

if __name__ == '__main__':
    main()