import math
import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    lcm = math.lcm
    n = int(input())
    a, b, c = map(int, input().split())
    ans = n//a+n//b+n//c - n//lcm(a, b) - \
        n//lcm(b, c) - n//lcm(a, c) + n//lcm(a, b, c)

    print(ans)


if __name__ == '__main__':
    main()