mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    a, b, c, d, e = map(int, input().split())
    L = (a + b) * (c + d)
    move = [0] * L
    for i in range(L):
        if i % (a+b) < a and i % (c+d) < c:
            move[i] = move[i-1] + 1
        else:
            move[i] = move[i-1]

    print(move[-1] * ((e - 1) // L) + move[(e-1) % L])


if __name__ == '__main__':
    main()