def gcd(x,y):
    while y>0:
        x,y = y,x%y
    return x
N = int(input())
a,b,c = map(int,input().split())
cnt = N//a+N//b+N//c
nab = gcd(a,b)
nab = a*b//nab
cnt -= N//nab
nbc = gcd(b,c)
nbc = b*c//nbc
cnt -= N//nbc
nca = gcd(c,a)
nca = c*a//nca
cnt -= N//nca
nabc = gcd(nab,c)
nabc = nab*c//nabc
cnt += N//nabc
print(cnt)