#include <stdio.h>

int fun(int n)
{
    int i;
    int tmp;
    int k;
    int count = 0;

    for(i=1;i<=n;i++)
    {
        tmp = i;
        while(tmp != 0)
        {
            if(tmp == 9 || k == 9)
            {
                count++;
            }
            k = tmp % 10;
            tmp = tmp / 10
 
;
        }
    }

    return (count-1);
}

int main()
{
    int num;
    int count = 0;

    printf("Please input n:");

    scanf("%d",&num);

    count = fun(num);

    printf("the number of 9 between 1 and %d is:%d\n",num,count);

    return 0;
}