#include<iostream>
#include <boost/math/common_factor_rt.hpp>
using namespace std;
int main(){
    long long int a,b,c,n,ans,r1,r2,r3,r4;
    cin >> n >> a >> b >> c;
    r1 = n/boost::math::lcm(a,b);
    r2 = n/boost::math::lcm(b,c);
    r3 = n/boost::math::lcm(c,a);
    r4 = n/boost::math::lcm(a,boost::math::lcm(b,c));
    ans = n/a + n/b + n/c;
    cout << ans-r1-r2-r3+r4 << endl;
    return 0;
}