n = int(input())
x,y,z = map(int,input().split())
a = []
b = []
c = []
abc = []
ab = []
bc = []
ca = []
for i in range(1,n+1):
    if i%x == 0:
        a += [i]
    if i%y == 0:
        b += [i]
    if i%z == 0:
        c += [i]
    if i%(x*y) == 0:
        ab += [i]
    if i%(y*z) == 0:
        bc += [i]
    if i%(z*y) == 0:
        ca += [i]
    if i%(x*y*z) == 0:
        abc += [i]
print(len(set(aa+bb+cc+abc+ab+bc+ca)))