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

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define RFOR(i,a,b) for (int i = (b)-1; i >= (a); i--)
#define REP(i,n) for (int i = 0; i < (n); i++)
#define RREP(i,n) for (int i = (n)-1; i >= 0; i--)
#define ALL(x) (x).begin(), (x).end()
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define MP(x,y) make_pair((x), (y))
#define MIN(a,b) (a > b ? b : a)
#define MAX(a,b) (a > b ? a : b)
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
#define MOD 1000000007
typedef long long ll;
template<typename T, typename U> inline void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> inline void amax(T &x, U y) { if(x < y) x = y; }
// -------------------------------------

long lcm(long n, long m) {
  return (n * m) / __gcd(n, m);
}

long N, a, b, c;

int main() {
  cin >> N >> a >> b >> c;
  long na = N / a;
  long nb = N / b;
  long nc = N / c;

  long ab = lcm(a, b);
  long bc = lcm(b, c);
  long ca = lcm(c, a);

  long nab = N / ab;
  long nbc = N / bc;
  long nca = N / ca;

  long abc = lcm(a, lcm(b, c));
  long nabc = N / abc;

  cout << na + nb + nc - nab - nbc - nca + nabc << endl;
  return 0;
}