def Predisposition(n):
    result = [1]
    i = 2
    while n != 1:
        if n % i == 0:
            result.append(i)
            n = n // i
        elif n % i > 0:
            i += 1
        if len(result) == 3:
            break
    return result

def gouseisu(N):
    N = N - 100
    while N <= N + 200:
        li = Predisposition(N)
        if len(li) == 3:
            return N
        else:
            N += 1

if __name__ == '__main__':
    N = int(input())
    print(gouseisu(N))