#include <stdio.h>

int main() {
    int i, count = 0;

    for (i = 0; i <= 2019; i++) {
        int m = i;
        while (m) {
            if (m % 10 == 9) {
                count++;
                break;
            }
            m /= 10;
        }
    }
    printf("%d\n", count);
    return 0;
}