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

signed main(){
  int a, b, c, d, e; cin >> a >> b >> c >> d >> e;
  int p = a+b, q = c+d;
  int r = p*q/gcd(p, q);
  int cnt = 0;
  vector<int> ccc(r+100, 0);
  for(int i = 0; i < r; i++){
    if((i) % p < a && (i) % q < c) {
      cnt++;
      ccc[i+1] = ccc[i] + 1;
    }else{ccc[i+1] = ccc[i]; }
  }
  cout << (e/r)*cnt + ccc[e%r] << endl;
}