from math import gcd

N = int(input())
A, B, C = map(int, input().split())

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

def lcm2(a, b, c):
    return lcm(lcm(a, b), c)

print(N//A+N//B+N//C-N//lcm(A,B)-N//lcm(B,C)-N//lcm(A,C)+N//lcm2(A,B,C))