#include<bits/stdc++.h>
#define REP(x,y,z) for(int x=y;x<=z;x++)
#define FORD(x,y,z) for(int x=y;x>=z;x--)
#define MSET(x,y) memset(x,y,sizeof(x))
#define FOR(x,y) for(__typeof(y.begin()) x=y.begin();x!=y.end();x++)
#define F first
#define S second
#define MP make_pair
#define PB push_back
#define SZ size()
#define M 
void RI(){}
template<typename... T>
void RI( int& head, T&... tail ) {
    scanf("%d",&head);
    RI(tail...);
}
using namespace std;
typedef long long LL;
int n,a,b,c;
int main()
{
	RI(n,a,b,c);

	LL ans = (LL)n/a + n/b + n/c;
	
	LL x = (LL)a*b / __gcd(a,b);
	ans -= n/x;

	x = (LL)a*c / __gcd(a,c);
	ans -= n/x;

	x = (LL)b*c / __gcd(b,c);
	ans -= n/x;

	x = x*a / __gcd(x,(LL)a);
	ans += n/x;

	printf("%lld\n",ans);
	
	return 0;
}