from fractions import gcd
N = input()
z = map(int,raw_input().split())
lcm = [z[i]*z[(i+1)%3]/gcd(z[i],z[(i+1)%3])for i in xrange(3)]
lcm_abc = lcm[0]*z[2]/gcd(lcm[0],z[2])
print sum(N/z[i]-N/lcm[i] for i in xrange(3))+N/lcm_abc