#include<iostream> using namespace std; int a(int m,int n) { if(m==0)return n+1; if(m>0,n==0)return a(m-1,1); if(m,n>0)return a(m-1,a(m,n-1)); } int main(){ int m,n; cin>>m>>n; cout<<a(m,n)<<endl; return 0; }