https://www.acmicpc.net/problem/14470
const fs=require('fs')
let ip=fs.readFileSync('/dev/stdin').toString().split('\n')
a=parseInt(ip[0])
b=parseInt(ip[1])
c=parseInt(ip[2])
d=parseInt(ip[3])
e=parseInt(ip[4])
time=0
if(a<0){
time+=Math.abs(a)*c;
a=0;
}
if(a==0) time+=d;
time+=(b-a)*e;
console.log(time);