#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main() {
int k, l, m, n, d, a[100005], cnt;
memset(a, 0, sizeof(a));
cnt=0;
scanf("%d%d%d%d%d", &k, &l, &m, &n, &d);
for(int i=k-1; i<d; i+=k) a[i]++;
for(int i=l-1; i<d; i+=l) a[i]++;
for(int i=m-1; i<d; i+=m) a[i]++;
for(int i=n-1; i<d; i+=n) a[i]++;
for(int i=0; i<d; i++) if(a[i]) cnt++;
printf("%d", cnt);
return 0;
}
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