#include <iostream>

bool boolIsHappy (int n) {
    while (n > 9) {
        if (n%10 <(n/10) % 10) {
            return false;
        }
        n = n / 10;
    }
    if (n % 10 >= (n/10) % 10) return true;
    return false;
}


int main () {
    int k = 0;
    for (int i = 0;i<999999;i++) {
        if (boolIsHappy(i)) k++;
    }
    std::cout << k;
}