#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; long long akm(long long m,long long n){ if(m==0) return n+1; if(m>0,n==0) return akm(m-1,1); if(m>0,n>0) return akm(m-1,akm(m, n-1)); } int main(){ int d,f; cin>>d>>f; cout<<akm(d,f); return 0; }