#include <iostream>
using namespace std;
int GetNum(int raw, int col)
{
if(raw == 1 || col == 1)
{
return raw+col;
}
else
{
return GetNum(raw-1, col) + GetNum(raw, col-1);
}
}
int main()
{
int raw,col;
while(cin>>raw>>col)
{
cout<<GetNum(raw, col)<<endl;
}
return 0;
}


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