#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
	int a , c , p , q , r , x , ans = 0;
	cin >> a >> c >> p >> q >> r >> x;
	ans = a;
	while(ans < c)
	{
		if(x >= p)
		{
			x -= p;
			ans++;
		}
		if(x < p)
		{
			cout << ans;
			return 0;
		}
	}
	if(x < p)
	{
		cout << ans;
	}
	return 0;
}