import math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

N = int(input())
A, B, C = map(int, input().split())
AB = lcm(A,B)
BC = lcm(B,C)
CA = lcm(C,A)
ABC = lcm(AB,BC)

print(N//A+N//B+N//C-N//AB-N//BC-N//CA+N//ABC)