N = input()
a, b, c = map(int, raw_input().split())

na = N/a
nb = N/b
nc = N/c
nab = N/(a*b)
nbc = N/(b*c)
nca = N/(c*a)
nabc = N/(a*b*c)

print na+nb+nc-nab-nbc-nca+nabc