#include<iostream>

using namespace std;

int count=0;
int a,b;

int main(){
cin>>a>>b;
for(int i=1;i<=a;i++){
int ii=i;
while(ii>0){
if(ii%10==b)
count++;
ii=ii/10;
}
}

cout<<count;

return 0;
}

#include <stdio.h>

int countDigit(int n, int x) {
int count = 0;
for (int i = 1; i <= n; i++) {
int num = i;
while (num > 0) {
if (num % 10 == x) {
count++;
}
num /= 10;
}
}
return count;
}

int main() {
int n, x;
scanf("%d %d", &n, &x);

int count = countDigit(n, x);

printf("%d\n", count);

return 0;
}

#include<iostream>
using namespace std;

int find(int i, int x)
{
int k = 0;

while(i != 0)
{
if (i % 10 == x)
k++;
i /= 10;
}
return k;
}

int getNumber(int end,int x)
{
int i;
int k = 0;
for (i = 1; i <= end; i++)
{
k += find(i, x);
}
return k;
}

int main()
{
int end, x;
cin >> end >> x;
cout << getNumber(end, x);
}

函数每次使用；
code:
#include<iostream>
using namespace std;
int n,x,ans=0;
int isx(int k)
{
while(k>0)
{
if(k%10==x) ans++;
k/=10;
}
}
int main(){
cin>>n>>x;
for(int i=1;i<=n;i++)
isx(i);
cout<<ans<<endl;
return 0;
}