def lcm(a, b):
    from fractions import gcd
    return (a * b) // gcd(a, b)

n=int(input())
a,b,c=map(int,input().split())
ans=n//a+n//b+n//c+n//lcm(lcm(a,b),c)-n//lcm(a,b)-n//lcm(a,c)-n//lcm(c,b)
print(ans)