#include <bits/stdc++.h>
#include <atcoder/all>

typedef unsigned long long ULLONG;
typedef long long LLONG;
static const LLONG MOD_NUM = 1000000007LL;//998244353LL;
static const LLONG INF_NUM = MOD_NUM * 20LL;
template<class _T> static void get(_T& a) {
	std::cin >> a;
}
template<class _T> static void get(_T& a, _T& b) {
	std::cin >> a >> b;
}
template<class _T> static void get(_T& a, _T& b, _T& c) {
	std::cin >> a >> b >> c;
}
template <class _T> static _T tp_abs(_T a) {
	if (a < (_T)0) {
		a *= (_T)-1;
	}
	return a;
}
template <class _T> static _T tp_pow(int x, int exp)
{
	_T ans = 1;
	_T base = x;
	while (exp > 0) {
		if (exp & 1) {
			ans = (ans * base);
		}
		base = (base * base);
		exp >>= 1;
	}
	return ans;
}

static void task();

int main()
{
	task();
	fflush(stdout);
	return 0;
}

static void task()
{
	int A, B, C, D, E;
	get(A, B);
	get(C, D);
	get(E);

	int ans = 0;
	int r1Time = 0;
	int r2Time = 0;
	for (int i = 0; i < E; i++) {
		int now = 0;
		if (r1Time < A) {
			now++;
		}
		r1Time++;
		if (r1Time == (A + B)) {
			r1Time = 0;
		}
		if (r2Time < C) {
			now++;
		}
		r2Time++;
		if (r2Time == (C + D)) {
			r2Time = 0;
		}
		if (now >= 2) ans++;
	}
	printf("%d\n", ans);
}