import math


def main():
    a, b, c, d, e = map(int, input().split())

    cycle = (a + b) * (c + d) // math.gcd(a + b, c + d)
    dp = [0] * (cycle + 1)
    for i in range(cycle):
        if 0 <= i % (a + b) < a and 0 <= i % (c + d) < c:
            dp[i + 1] = 1

    q, r = divmod(e, cycle)
    ans = q * sum(dp[:]) + sum(dp[:r])
    print(ans)


if __name__ == "__main__":
    main()