#include <stdio.h>
int reverse(int num)
{
int temp, result = 0;
while(num != 0) {
temp = num % 10;
result = result * 10 + temp;
num /= 10;
}
return result;
}
int main () {
int n;
int count = 0;
scanf("%d", &n);
for(int i = 1;i <= n; i++) {
int r = reverse(i);
if(i % r == 0) {
count++;
}
}
printf("%d", count);
return 0;
}