1
#include <bits/stdc++.h>
2
using namespace std;
3
int main()
4
{
5
    int a,b,c;
6
    cin>>a>>b>>c;
7
    int k;
8
    cin>>k;
9
    int add=pow(2,k);
10
    if(a>=b && a>=c) {
11
        //a is the largest
12
        cout<<a*add+b+c;
13
    }
14
    else if(b>=c)
15
    {
16
        //b is the largest
17
        cout<<a+b*add+c;
18
    }
19
    else {
20
        //c is the largest
21
        cout<<a+b+c*add;
22
    }
23
 
24
}