N = int(input())
a = list(map(int,input().split()))
A = sum(N//i for i in a)
B = 0
from math import gcd
for i in range(2):
    for j in range(i+1,3):
        m = a[i]*a[j]//gcd(a[i],a[j])
        B += N//m
m = a[0]*a[1]//gcd(a[0],a[1])
m = m*a[2]//gcd(m,a[2])
C = N//m
print(A-B+C)
#print(A,B,C)