```go
package main

import "fmt"

func main() {
	var n, p1, p2, p3, t1, t2 int
	fmt.Scan(&n, &p1, &p2, &p3, &t1, &t2)
	periods := make([][2]int, n)
	for i := 0; i < n; i++ {
		fmt.Scan(&periods[i][0], &periods[i][1])
	}
	total := int64(0)
	for i := 0; i < n; i++ {
		l := periods[i][0]
		r := periods[i][1]
		total += int64(p1) * int64(r-l)
	}
	for i := 0; i < n-1; i++ {
		r := periods[i][1]
		nextl := periods[i+1][0]
		g := nextl - r
		a := min(t1, g)
		total += int64(p1) * int64(a)
		rem := g - a
		if rem > 0 {
			b := min(t2, rem)
			total += int64(p2) * int64(b)
			rem -= b
			if rem > 0 {
				total += int64(p3) * int64(rem)
			}
		}
	}
	fmt.Println(total)
}

func min(x, y int) int {
	if x < y {
		return x
	}
	return y
}
```