#include<bits/stdc++.h>
#define EM 1000000
using namespace std;
using LL = long long;
using P = pair<LL, LL>;
LL LINF = 1e18;
int INF = 1e9;
LL mod = 1e9+7;
using vint = vector<int>;
using vLL = vector<LL>;
using vvint = vector<vector<int>>;
using vvLL = vector<vector<LL>>;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int gcd(int a, int b){
	if(b == 0)	return a;
	else return gcd(b, a%b);
}

int main(){
    LL N;
    LL a, b, c;
    cin >> N >> a >> b >> c;
    LL ab = a*b/gcd(a, b);
    LL ac = a*c/gcd(a, c);
    LL bc = b*c/gcd(b, c);
    LL abc = ab*c/gcd(ab, c);
    LL ans = N/a+N/b+N/c-N/ab-N/ac-N/bc+N/abc;
    cout << ans << endl;
}