1
n = int(input())
2
if n < 2:
3
    print('No')
4
else:
5
    for i in range(2, int(n**0.5) + 1):
6
        if n % i == 0:  # 能整除，说明不是质数
7
            print('No')
8
            break
9
    else:  # 循环正常结束（没有被break），说明是质数
10
        print('Yes')

1
for i in range(1, 10):
2
    for j in range(1, i + 1):
3
        print(f'{j}*{i}={i*j}', end=' ')
4
    print()  # 换行

1
for x in range(0, 21):
2
    for y in range(0, 34):
3
        z = 100 - x - y
4
        if 5*x + 3*y + z/3 == 100:
5
            print(f'公鸡{x}只，母鸡{y}只，小鸡{z}只')

1
n = input()
2
if n == n[::-1]:
3
    print('Yes')
4
else:
5
    print('No')

1
n = int(input())
2
number = n
3
reversed_num = 0
4
while n > 0:
5
    digit = n % 10          # 取出最后一位
6
    reversed_num = reversed_num * 10 + digit  # 拼到反转数后面
7
    n = n // 10             # 去掉最后一位
8
if number == reversed_num:
9
    print('Yes')
10
else:
11
    print('No')

1
total = 1
2
count = 0
3
for i in range(3, 100, 2):
4
    count += 1
5
    if count % 2 != 0:
6
        total -= 1/i
7
    else:
8
        total += 1/i
9
print(total)