from fractions import gcd
def lcm(a,b):
 return a*b//gcd(a,b)
n=int(input())
a,b,c=map(int,input().split())
ans=n//(a+b+c)+n//lcm(lcm(a,b),c)-n//lcm(a,b)-n//lcm(a,c)-n//lcm(c,b)
print(ans)