from collections import defaultdict
from heapq import heapify, heappop, heappush
import sys
input = sys.stdin.readline

def main():
    n, m = map(int, input().split())
    H = list(map(int, input().split()))
    G1 = defaultdict(list)
    G2 = defaultdict(list)
    for _ in range(m):
        x, y = map(int, input().split())
        x -= 1
        y -= 1
        G1[x].append((y, H[y] - H[x]))
        G2[y].append((x, H[x] - H[y]))

    DP = [[-1, -1] for _ in range(n)]
    DP[0][0] = 0
    H = [(0, 0, 0)]
    heapify(H)
    while H:
        cnt, cp, up = heappop(H)
        cnt *= -1
        if cnt < DP[cp][up]:
            continue
        if cp == n - 1:
            continue
        for np, d in G1[cp]:
            if d > 0:
                if up == 0:
                    if cnt + d <= DP[np][1]:
                        continue
                    DP[np][1] = cnt + d
                    heappush(H, (-DP[np][1], np, 1))
            else:
                if cnt <= DP[np][0]:
                    continue
                DP[np][0] = cnt
                heappush(H, (-DP[np][0], np, 0))
    print(max(DP[n - 1]))

    DP = [[-1, -1] for _ in range(n)]
    DP[n - 1][0] = 0
    H = [(0, n - 1, 0)]
    heapify(H)
    while H:
        cnt, cp, up = heappop(H)
        cnt *= -1
        if cnt < DP[cp][up]:
            continue
        if cp == 0:
            continue
        for np, d in G2[cp]:
            if d > 0:
                if up == 0:
                    if cnt + d <= DP[np][1]:
                        continue
                    DP[np][1] = cnt + d
                    heappush(H, (-DP[np][1], np, 1))
            else:
                if cnt <= DP[np][0]:
                    continue
                DP[np][0] = cnt
                heappush(H, (-DP[np][0], np, 0))
    print(max(DP[0]))

if __name__ == '__main__':
    main()