#include using namespace std; typedef long long ll; const ll mod=1e9+7; ll A,B; ll ans; int main(){ cin.tie(0); ios::sync_with_stdio(false); cin>>A>>B; ll AB=A+B; ll ans=mod; for(ll C=1; C<=sqrt(AB); C++){ if(AB%C==0){ ll AC=A+C; ll BC=B+C; if((AC%B==0)&&(BC%A==0)){ if(A!=C&&B!=C) ans=min(ans,C); } ll D=AB/C; ll AD=A+D; ll BD=B+D; if((AD%B==0)&&(BD%A==0)){ if(A!=D&&B!=D) ans=min(ans,D); } } } if(ans!=mod) cout<