```go
package main

import (
	"fmt"
	"math"
)

func main() {
	var n, k int
	fmt.Scan(&n, &k)

	var prevX, prevY float64
	fmt.Scan(&prevX, &prevY)

	var totalDist float64
	for i := 0; i < n-1; i++ {
		var curX, curY float64
		fmt.Scan(&curX, &curY)
		totalDist += math.Hypot(curX-prevX, curY-prevY)
		prevX, prevY = curX, curY
	}

	time := totalDist * float64(k) / 50.0
	fmt.Printf("%.9f\n", time)
}
```