A,B,C,D,E = map(int,input().split())

import math
L = (A + B) * (C + D) // math.gcd(A + B, C + D)

def f(X): # X秒間にどれだけ重複するか
    res = 0
    for m in range(1, X + 1):
        if (1 <= m % (A + B) <= A) and (1 <= m % (C + D) <= C):
            res += 1
    return res
        
ans = f(L) * (E // L)
ans += f(E % L)

print(ans)