Go: package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"fmt"
	)

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	for scanner.Scan() {
		buf := strings.Split(scanner.Text(), " ")
		n, _ := strconv.Atoi(buf[0])
		x, _ := strconv.Atoi(buf[1])
		prime_table := make([]int, 1000001)
		prime_table[0] = -1
		prime_table[1] = -1
		for i := 2; i < 1000001; i++ {
			if prime_table[i] != -1 {
				prime_table[i] = 1
				for j := 2*i; j < 1000001; j += i {
					prime_table[j] = -1 // -1 means "not prime"
				}
			}
		}
		dp := make([]int, x+1)
		dp[0] = 1
		menu := make([]int, n)
		for i := 0; i < n; i++ {
			scanner.Scan()
			menu[i], _ = strconv.Atoi(scanner.Text())
		}
		for i := 0; i < n; i++ {
			for j := 0; j <= x; j++ {
				if menu[i] <= j && dp[j-menu[i]] != 0 {
					// log.Println(dp)
					dp[j] = 1
				}
			}
		}
		flag := true
		for j := x; j >= 0; j-- {
			if prime_table[j] == 1 && dp[j] == 1 {
				flag = false
				fmt.Println(j)
				break
			}
		}
		if flag {
			fmt.Println("NA")
		}
	}
}

Python: def init():
    table = [True] * 1000001
    table[0] = False
    table[1] = False
    n = len(table)
    for i in range(2, n):
        for j in range(i + i, n, i):
            table[j] = False
    return table
    
def is_prime(p):
    if p == 0 or p == 1:
        return False
    for i in range(2, p - 1):
        if p % i == 0:
            return False
    return True

def solve(price, ps, is_prime):
    dp = []
    for i in range(len(ps)):
        dp.append([False] * (price + 1))

    dp[0][ps[0]] = True
    dp[0][0]     = True

    for i in range(1, len(ps)):
        for p in range(price + 1):
            if p >= ps[i]:
                dp[i][p] = dp[i - 1][p] or dp[i][p - ps[i]]
            else:
                dp[i][p] = dp[i - 1][p]

    p = -1
    for i in range(0, price + 1):
        if is_prime[i] and dp[len(ps) - 1][i]:
            p = i
    if p == -1:
        print("NA")
    else:
        print(p)
    
def main():
    table = init()
    while True:
        n, price = map(int,raw_input().split())
        if n == 0 and price == 0:
            return
        ps = []
        for i in range(n):
            ps.append(int(raw_input()))
        solve(price, ps, table)

main()

Python: from datetime import datetime

def measure(f):
    measure_start = datetime.now()
    v = f()
    print(datetime.now() - measure_start)
    return v

input = raw_input
range = xrange
    
def init():
    table = [True] * 1000001
    table[0] = False
    table[1] = False
    n = len(table)

    def prime(p):
        for i in range(p + p, n, p):
            table[i] = False
    prime(2)
    prime(3)
    prime(5)
    prime(7)
    prime(11)
    prime(13)
    
    for i in range(2, n):
        if (i % 2 != 0 and i % 3 != 0 and i % 5 != 0 and
            i % 7 != 0 and i % 11 != 0 and i % 13 != 0):
            for j in range(i + i, n, i):
                table[j] = False
    return table
    
def solve(price, ps, is_prime):
    dp = [0] * ((price >> 5) + 1)

    def get(i):
        return ((dp[i >> 5] >> (i & 31)) & 1)

    def set(i, v):
        dp[i >> 5] |= (v << (i & 31))

    def get_p(i):
        return dp[i >> 5]
    def set_p(i, v):
        dp[i >> 5] |= v
        
    if ps[0] <= price:
        set(ps[0], 1)
    set(0, 1)

    for i in range(1, len(ps)):
        cur_p = ps[i]
        i1 = cur_p & 31
        rest = 0

        for p in range(cur_p, price + 1, 32):
            v = get_p(p - cur_p)
            rest = (v >> (32 - i1)) & ((1 << i1) - 1)
            set_p(p, (v << i1) | rest)
            
    p = -1
    for i in range(0, price + 1):
        if is_prime[i] and get(i) == 1:
            p = i
    if p == -1:
        print("NA")
    else:
        print(p)
    
def main():
    table = init()
    while True:
        n, price = map(int,input().split())
        if n == 0 and price == 0:
            return
        ps = []
        for i in range(n):
            ps.append(int(input()))
        solve(price, ps, table)

main()

Python: input = raw_input

def init():
    table = [True] * 2000001
    table[0] = False
    table[1] = False
    n = len(table)
    for i in range(2, n):
        for j in range(i + i, n, i):
            table[j] = False
    return table
    
def is_prime(p):
    if p == 0 or p == 1:
        return False
    for i in range(2, p - 1):
        if p % i == 0:
            return False
    return True

def solve(price, ps, is_prime):
    dp = []
    for i in range(len(ps)):
        dp.append([False] * (price + 1))

    dp[0][ps[0]] = True
    dp[0][0]     = True

    for i in range(1, len(ps)):
        for p in range(price + 1):
            if p >= ps[i]:
                dp[i][p] = dp[i - 1][p] or dp[i][p - ps[i]]
            else:
                dp[i][p] = dp[i - 1][p]

    p = -1
    for i in range(0, price + 1):
        if is_prime[i] and dp[len(ps) - 1][i]:
            p = i
    if p == -1:
        print("NA")
    else:
        print(p)
    
def main():
    table = init()
    while True:
        n, price = map(int,input().split())
        if n == 0 and price == 0:
            return
        ps = []
        for i in range(n):
            ps.append(int(input()))
        solve(price, ps, table)

main()

Python: def sieve():
    p = [1] * 1000001;p[0] = p[1] = 0
    
    for i in range(1000):
        if p[i]:
            for j in range(i * i, 1000001, i):p[j] = 0
    return p

def solve(p, menu, x):
    menu.sort()
    num = [0] * (max(menu) + x + 1);num[0] = 1 
    
    cnt = 0
    for i in range(x + 1):
        if p[i]:
            cnt += 2 * len(menu)
            for mi in menu:num[i + mi] = 1
            if i < cnt:break
    for j in range(i,x + 1):
        for mj in menu:
            if num[j - mj]:
                num[j] = 1
                break
                
                
                
    for i in reversed(range(1, x + 1)):
        if p[i] and num[i]:
            return i
    return 'NA'

import sys
f = sys.stdin

p = sieve()
while True:
    
    n, x = map(int, f.readline().split())
    if n == 0:
        break
    menu = [int(f.readline()) for _ in range(n)]
    print(solve(p, menu, x))