x = int(input())
cnt = 0
a,b,c = map(int, input().split())
z = min(a,b,c)
if z<x and x%z==0:
    cnt=1
for y in range(z, x):
    if y%a == 0 or y%b==0 or y%c==0:
        cnt+=1
    y = z * y
print(cnt)