x = 7
i = 1
flag = 0
while i <= 100:
    if (x%2 == 1) and (x%3 ==2) and (x%5 ==4) and (x%6 ==5):
        flag = 1
    else:
        x = 7 * (i + 1)
    i = i + 1
if flag == 1:
    print('阶梯数是', x)
else:
    print('在限定的范围内找不到答案')