#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<to;x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

ll N;
ll A,B,C;
void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	cin>>A>>B>>C;
	
	ll AB=A*B/__gcd(A,B);
	ll BC=B*C/__gcd(B,C);
	ll CA=C*A/__gcd(C,A);
	ll ABC=AB*C/__gcd(AB,C);
	
	
	ll ret=N/ABC-N/AB-N/BC-N/CA+N/A+N/B+N/C;
	cout<<ret<<endl;
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false);
	FOR(i,argc-1) s+=argv[i+1],s+='\n';
	FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	solve(); return 0;
}