#include <stdio.h>
bool isPrime_2(int n){

    if ((n == 2) || (n == 3)) return 1;
    if ((n % 6 != 1) && (n % 6 != 5)) return 0;
    for (int i = 5; i*i <= n; i += 6){
        if ((n%i == 0) || (n % (i + 2) == 0))
            return 0;
    }
    return 1;
}
void xuanxian2()
{
    int n; int m;
    int i, s = 0;
    scanf("%d", &n);
    scanf("%d", &m);
    for (i = n; i <= m; i++){
        if (isprime_1(i)){
            printf("%d ", i);
        }
    }
    printf("\n");
}

void xuanxian1()
{
    int n,i,total = 1;
    scanf("%d", &n);
    for (i = 2; i <= n; ++i) total *= i;
    printf("%d\n", total);
}

void xuanxian3()
{
    int n;
    scanf("%d", &n);
    if (((n % 400) == 0) || (((n % 4) == 0) && ((n % 100) != 0))){
        printf("%d是闰年\n", n);
    }
    else{
        printf("%d非闰年\n", n);
    }
}
int main()
{
    int index = 2;

    printf("1 计算n!\n");
    printf("2 输出素数\n");
    printf("3 判定闰年\n");

    scanf("%d", &index);
    switch (index)
    {
    case 1: xuanxian1(); break;
    case 2: xuanxian2(); break;
    case 3: xuanxian3(); break;
    default: printf("INPUT ERROR!\n");
    }
    return 0;
}