#include<cstring> #include<cmath> using namespace std; int sum(int m,int n){ if(m==0){ return n+1; } else if(m>0&&n==0){ return sum(m-1,1); } else{ return sum(m-1,sum(m,n-1)); } } int main(){ int i,m; cin>>i>>m; cout<<sum(i,m); return 0; }