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

s_set = set()

if a == 1 or b == 1 or c == 1:
    print(n)
    exit(1)

for i in range(a, n + 1, a):
    s_set.add(i)

for i in range(b, n + 1, b):
    s_set.add(i)

for i in range(c, n + 1, c):
    s_set.add(i)

print(len(s_set))