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#include<bits/stdc++.h>
using namespace std;

int a,b;

int main(){

    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>a>>b;
    if(b%a){
        cout<<b-a;
    }else{
        cout<<a+b;
    }

    return 0;
}

Measured memory_bytes: 256