def D(a,b):
    c=a*b
    while a%b:
        a,b=b,a%b
    return c//b

n=int(input())
a,b,c=map(int,input().split())
ab=D(a,b)

A=n//a + n//b + n//c
B=n//ab + n//D(a,c) + n//D(c,b)
C=n//D(ab,c)
print(A-B+C)