#include <bits/stdc++.h>
#define INT long long int
#define N 3
#define PA pair<INT, INT>
#define oo 9876543219876543
#define MOD 1000000007
using namespace std;
INT T;
string s[100];
char in[100];
int main()
{
    //ios::sync_with_stdio(false);
    srand(time(NULL));
    for(int i = 0 ; i < 50 ; i++ )
    {
        sprintf(in, ".%d.in", i+1);
        freopen(in, "w", stdout);
        INT x, y, a, b;
        cin>>x>>y>>a>>b;
        cout<<x<<" "<<y<<" "<<a<<" "<<b<<endl;
        sprintf(in, ".%d.out", i+1);
        freopen(in, "w", stdout);
        if( x > y ) swap(x, y);
        cout<<min( x*b + (y-x)*a, (x+y)*a )<<endl;
    }
    return 0;
}