#include <bits/stdc++.h>
using namespace std;

int main()
{
	long long A, B, C, D, E;
	cin >> A >> B >> C >> D >> E;

	int ab = A + B;
	int cd = C + D;
	int lcm = ab / __gcd( ab, cd ) * cd;
	vector<int> v( lcm );
	for( int i = 0; i < lcm; i++ ) {
		if( i % ab < A ) v[i] = 1;
	}
	for( int i = 0; i < lcm; i++ ) {
		if( i % cd < C ) v[i] &= 1;
		else v[i] = 0;
	}
	int cnt = 0;
	for( int i = 0; i < lcm; i++ ) {
		if( v[i] ) cnt++;
	}
	int ans = E / lcm * cnt;
	int r = E % lcm;
	vector<int> vv( r );
	for( int i = 0; i < r; i++ ) {
		if( i % ab < A ) vv[i] = 1;
	}
	for( int i = 0; i < r; i++ ) {
		if( i % cd < C ) vv[i] &= 1;
		else vv[i] = 0;
	}
	cnt = 0;
	for( int i = 0; i < r; i++ ) {
		if( vv[i] ) cnt++;
	}
	ans += cnt;

	cout << ans << endl;
}