#include<bits/stdc++.h> using namespace std; int acm(int m,int n){ if(m==0) return n+1; else if(m>0&&n==0) return acm(m-1,1); else return acm(m-1,acm(m,n-1)); } int main() { int a,b; cin>>a>>b; cout<<acm(a,b); return 0; }