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

ans = (N//a) + (N//b) + (N//c)
ans -= (N//(math.lcm(a, b))) + (N//(math.lcm(b, c))) + (N//(math.lcm(c, a)))
ans += N//(math.lcm(a, b, c))
print(ans)