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

if c%a == 0:
    c = N+1
if b%a == 0:
    b = N+1

divA = N/a
divB = N/b
divC = N/c
div1 = divA + divB + divC

divAB = N/(a*b)
divBC = N/(b*c)
divCA = N/(c*a)
div2 = divAB + divBC + divCA

div3 = N/(a*b*c)

print div1 - div2 + div3