a =[True] * 1001
#True means open false means closed

for x in range(2,1001):
    for i in range(0,1001):
        if (i % x == 0):
            if (a[i] == True):
                a[i] = False
            elif (a[i] == False):
                a[i] = True

for i in range(0,1001):
    if a[i] == False:
       print(i)