#include<bits/stdc++.h>
using namespace std;
int a,b,c,ks,js,s;
int main(){
    scanf("%d%d%d",&a,&b,&c);
    for(int i=1;i<4;i++){
        scanf("%d%d",&ks,&js);
        if(i==1) s += (js-ks)*c;
        if(i==2) s += (js-ks)*b;
        else s += (js-ks)*a;
    }
    printf("%d",s);
    return 0;
}