#include <iostream> using namespace std; static int cn=0; int fun(int a,int b) { if(a < 0 || b < 0){ return 0; } if(a ==0 && b == 0){ cn++; return 0; } return fun(a-1,b) + fun(a,b-1); } int main() { int a,b; while(cin >> a >&...