C++ :

#include <iostream>
using namespace std;
int check(int x, int y) {
int cnt = 0;
while (x > 0) {
int tmp = x % 10;
if (tmp == y) {
cnt++;
}
x = x / 10;
}
return cnt;
}
int main() {
int n, k;
cin >> n >> k;
int ans = 0;
for (int i = 1; i <= n; i++) {
ans += check(i, k);
}
cout << ans << endl;
return 0;
}