#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> iint;
typedef pair<ll,ll> llll;
#define ALL(x) (x).begin(),(x).end()
const ll zero = 0;
const ll one = 1;
const ll INF = 9223372036854775807; //10^18
const int inINF = 2147483647; //10^9
const ll MOD = 1000000007; //10^9+7
const ll MOD2 = 998244353;
void Yes() {printf("Yes\n");}
void No() {printf("No\n");}
void YES() {printf("YES\n");}
void NO() {printf("NO\n");}

int main(){
    int a, b, c, d, e, p;
    cin >> a >> b >> c >> d >> e;
    p = (a+b) * (c+d);
    vector<bool> f(p,false);
    int x, y;
    x = a+b;
    y = c+d;
    for (int i = 0; i < p; i++) {
        if(i%x < a && i%y < c){
            f[i] = true;
        }
    }
    int cnt = 0;
    for (int i = 0; i < p; i++) {
        if(f[i]) cnt++;
    }
    int ans = e/p * cnt;
    for (int i = 0; i < e%p; i++) {
        if(f[i]) ans++;
    }
    cout << ans << endl;

}