#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000

int main(){
	
	int A,B,C,D;
	cin>>A>>B>>C>>D;
	
	vector<bool> f0((A+B)*(C+D),false),f1((A+B)*(C+D),false);
	
	rep(i,f0.size()){
		if(i%(A+B)<A)f0[i] = true;
	}
	rep(i,f1.size()){
		if(i%(C+D)<C)f1[i] = true;
	}
	
	int E;
	cin>>E;
	
	int sum = 0;
	int ans = 0;
	rep(i,f0.size()){
		if(f0[i]&&f1[i])sum++;
	}
	
	ans += (E/((A+B)*(C+D))) * sum;
	E %= ((A+B)*(C+D));
	
	rep(i,E){
		if(f0[i]&&f1[i])ans++;
	}
	
	cout<<ans<<endl;
	
	
    return 0;
}