1 #include <cstdio> 2 #include <cstring> 3 #include <algorithm> 4 #define ll __int64 5 using namespace std; 6  7 ll A(ll m, ll n) 8 { 9     if(n==0) return A(m-1,1);10     else if(m==1) return n+2;11     else if(m==2) return 2*n+3;12     else return A(m,n-1)*2+3;13 }14 15 int main()16 {17     ll m,n;18     while(scanf("%I64d%I64d",&m,&n)!=EOF)19     {20         printf("%I64d\n",A(m,n));21     }22     return 0;23 }