prime_nums (Ivo Kirilov)

num = int(input())

prime_list = []
for i in range(2, num + 1):
    for x in range(2, i):
        if (i % x) == 0:
            break
    else:
        prime_list.append(str(i))

for el in range(int(-(-len(prime_list)//20 // 1))):
    if len(prime_list) > 20:
        print(", ".join(prime_list[:20]))
        prime_list = prime_list[20:]
    else:
        print(", ".join(prime_list))