#include<stdio.h>

int gcd(int x,int y){
  int r=x%y;
  while(r>0){
    x=y;
    y=r;
    r=x%y;
  }
  return y;
}

void run(void){
  int n,a,b,c;
  scanf("%d%d%d%d",&n,&a,&b,&c);

  int ans=n/a+n/b+n/c;
  int l=(a*b/gcd(a,b));
  ans-=n/l+n/(b*c/gcd(b,c))+n/(c*a/gcd(c,a));
  ans+=((long long int)l*c/gcd(l,c)<=n)*n/(c/gcd(l,c)*l);
  printf("%d\n",ans);
  return;
}

int main(void){
  run();
  return 0;
}