import sys
from math import gcd

def debug(x, table):
    for name, val in table.items():
        if x is val:
            print('DEBUG:{} -> {}'.format(name, val), file=sys.stderr)
            return None

def lcm(a, b):
    return a * b // gcd(a, b)

def solve():
    N = int(input())
    a, b, c = map(int, input().split())

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

    print(ans)

if __name__ == '__main__':
    solve()