#include <iostream>
using namespace std;
int main() {
int n, k;
cin>>k>>n;
int dp[k+1][k*9+10]={};
for(int i=0; i<=9; i++)
dp[1][i]=1;
for(int len =2; len<=k; len++){
for (int s=0; s<=len*9; s++){
for(int i=0; i<=9; i++)
dp[len][s+i]+=dp[len-1][s];
}
}
cout<<dp[k][n]<<endl;
return 0;
}
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