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

#define int long long

void solve(){
    int a, b;
    cin >> a >> b;
    
    cout << (min(a, b) << 1);
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int T = 1;
    // cin >> T;
    while(T--) solve();

    return 0;
}