#include <iostream>
#include<string>
using namespace std;
int main() {
    int n;
    char x;
    cin >> n;
    cin >> x;
    string a;
    int num = 0;
    for (int i = 1; i <= n; i++) {
        a = to_string(i);
        for (char j : a) {
            if (j == x) num++;
        }
    }
    cout << num;
}

运用了字符串的知识