```#include <stdio.h>
int is(int n);
int main()
{
    int k = 0;
    int n = 10;
    int t = 0;
    //scanf_s("%d", &n);
    for (; n > 0; n--)
    {
        if (is(n))
            t++;
    }
    printf("%d", t);
    return 0;
}

int is(int k)
{
    int p = 0;
    int i = 0;
    for (i = 2; i < k; i++)
    {
        if (k % i == 0)
        {
            break;
        }
    }           
    if (i == k) p = 1;
    else p = 0;
    return p;
}