#include <stdio.h>
typedef long long ll;
ll gcd(ll a, ll b){
   if( b > a){ ll tmp = b; b = a; a = tmp;}
   ll amari;
   while( ( amari = a % b ) != 0 ){ a = b; b = amari; }
   return b;
}
ll lcm(ll a, ll b){ return a / gcd(a,b) * b;}
int main(){
   ll N,a,b,c;
   scanf("%lld %lld %lld %lld", &N, &a, &b, &c);
   printf("%lld\n", N/a+N/b+N/c-N/lcm(a,b)-N/lcm(b,c)-N/lcm(c,a)+N/lcm(a,lcm(b,c)));
}