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codeforces-insomnia cure 

#include<iostream>
using namespace std;
int main()
{
 int k,l,m,n;
 long d,count=0;
 cin>>k>>l>>m>>n>>d;
 for(long i=1;i<=d;i++)
 {
  if(i%k!=0 and i%l!=0 and i%m!=0 and i%n!=0)
   count++;
 }
 cout<<d-count;
 return 0;
}

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