#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  for(int i=0;i<(n);++i)
#define FORq(i, m, n) for(int i = (m);i <= (n);++i)
#define SCD(n) scanf("%d",&n)
#define SCD2(m,n) scanf("%d%d",&m,&n)
#define SCD3(m,n,k) scanf("%d%d%d",&m,&n,&k)
#define PB push_back
#define MP make_pair
#define ARSCD(A,N) REP(i,N){SCD(A[i]);}
#define ARSCD1(A,N) FORq(i,1,N){SCD(A[i]);}
#define PRINTD(n) printf("%d\n",n)
#define PRINTLLD(n) printf("%lld\n",n)
#define DEBUG printf("%s\n","debug")
#define fst first
#define snd second
#define IN(x,S) (S.count(x) != 0)
using namespace std;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef long long ll;
//////////////////////////////////////////////////////
ll llgcd(ll x,ll y){
	if (x<y) return llgcd(y,x);
	if (y==0) return x;
	ll r = x % y;
	return llgcd(y,r);
}

ll llcm(ll x,ll y){
	return (x*y)/llgcd(x,y);
}

int main(){
	int N; SCD(N);
	int a,b,c; SCD3(a,b,c);
	PRINTD(N/a + N/b + N/c - N/llcm(a,b) - N/llcm(b,c) - N/llcm(c,a) + N/llcm(a,llcm(b,c)));
	return 0;
}