#include <iostream> #include <algorithm> #include <vector> #include <iomanip> #include <map> #include <queue> #include <limits> static const int MOD = 1000000007; using ll = long long; using u32 = unsigned; using namespace std; template<class T> constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208; int main() { int a, b; cin >> a >> b; if(a > b){ cout << 2000000000-1-b<< "\n"; }else { cout << b-2 << "\n"; } return 0; }