import math
N = int(input())
a,b,c = map(int, input().split())
ca = N // a
cb = N // b
cc = N // c
cab = N // (a*b // math.gcd(a,b))
cac = N // (a*c // math.gcd(a,c))
cbc = N // (b*c // math.gcd(b,c))
cabc = N // (a*b*c // math.gcd(a,b,c))
cfb = ca + cb + cc - cab - cac - cbc + cabc
print(cfb)