Codeforces_148A

//Codeforces Round 148A
#include <iostream>
using namespace std;
int main()
{
    int k, l, m, n, d, answ=0;
    cin >> k >> l >> m >> n >> d;
    for(int i=1;i<d+1;i++)
    {
        if(i%k==0){answ++;}
        else if(i%l==0){answ++;}
        else if(i%m==0){answ++;}
        else if(i%n==0){answ++;}
    }
    cout << answ;
    return 0;
}