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

int main() {
    vector<int> a( 4 );
    for( int i = 0; i < 4; i++ ) cin >> a[i];
    int ans = 0;
    for( int i = 0; i < 4; i++ ) ans += a[i];
    int ma = 0;
    for( int i = 0; i < 3; i++ ) ma = max( ma, a[i] );
    ans = max( ans, ma * 3 );
 
    cout << ans << endl;
}