#include <bits/stdc++.h>
template<class T> inline bool chmin(T&a, T b){if(a > b){a = b; return true;}else{return false;}}
template<class T> inline bool chmax(T&a, T b){if(a < b){a = b; return true;}else{return false;}}
#define ll long long
#define double long double
#define rep(i,n) for(int i=0;i<(n);i++)
#define REP(i,n) for(int i=1;i<=(n);i++)
#define mod (ll)(1e9+7)
#define inf (ll)(3e18+7)
#define eps (double)(1e-9)
#define pi (double) acos(-1)
#define P pair<int,int>
#define PiP pair<int,pair<int,int>>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
using namespace std;

int main() {
    int a, b, c, d, e;
    cin >> a >> b >> c >> d >> e;
    ll ans = 0, x = (a+b), y = (c+d);
    if(e <= x*y){
        rep(i, e){
            if(i % x < a && i % y < c)ans++;
        }
        cout << ans << endl;
        return 0;
    }
    rep(i, x*y){
        if(i % x < a && i % y < c)ans++;
    }
    ans *= e/(x*y);
    e %= (x*y);
    rep(i, e){
        if(i % x < a && i % y < c)ans++;
    }
    cout << ans << endl;
}