#include <iostream>
using namespace std;
int main() {
long long k,a,b,x,y,c,d;
cin>>k>>a>>x>>b>>y;
if(k==0){cout<<0; return 0;}
if(a>=k){a=0;x=0;}
if(b>=k){b=0;y=0;}
if(k!=0){
c=x*(k-a)+y*(k-a-b);
d=y*(k-a)+x*(k-a-b);
}
if(d>=c){cout<<abs(d);}
if(c>d){cout<<abs(c);}
return 0;
}
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