http://119.27.163.117/blog/lxylluvio/post/114

#include<bits/stdc++.h>
using namespace std;
signed main(int argc,char*argv[]){
    int n;
    cin >> n;
    int m;
    cin >> m;
    int dd = min(n,m);
    int db = max(n, m);
    int ddv = db, ddd = dd;
    ddv ^= ddv;
    dd += ddv;
    cout << dd + db << '\n';
    return 0;
}