def sigeki(N, a, b, c):
    not_cnt = 0
    for n in range(1, N + 1):
        if (n % a > 0) and (n % b > 0) and (n % c > 0):
            not_cnt += 1
    result = N - not_cnt
    return result

def main():
    N = int(input())
    a, b, c = map(int, input().split())
    print(sigeki(N, a, b, c))

if __name__ == '__main__':
    main()