package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var n int
	if _, err := fmt.Fscan(in, &n); err != nil {
		return
	}

	k := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Fscan(in, &k[i])
	}

	ans := int(1e9)
	for i := 0; i < n; i++ {
		sum := 0
		for j := 0; j < k[i]; j++ {
			var m int
			fmt.Fscan(in, &m)
			sum += m
		}
		time := sum*5 + k[i]*15
		if time < ans {
			ans = time
		}
	}

	fmt.Fprintln(out, ans)
}