#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,k,s=0;
    cin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        int a=i;
        while(a!=0)
        {
            if(a%10==k)s++;
            a/=10;
        }
    }
    cout<<s;
}

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;
}