#include <iostream>
using namespace std;

int solve(int n, int m){
    int i, sum;

    if (m == 1)
        return 1;
    sum = 0;
    for (i = 1; i < n; i++)
        sum += solve(i, m - 1);
    return sum;
}

int main(){
    int n, m;

    cin>>n>>m;
    cout<<solve(n, m)<<endl;
    return 0;
}

请填写答案。

{{ input(1) }}