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

def lcm(a, b):
    return a * b // fractions.gcd(a, b)

count = N//a + N//b + N //c
count = count - (N//lcm(a, b)) - (N//lcm(b, c)) - (N//lcm(a, c)) + (N//lcm(lcm(a,b),c))
print(count)