import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

n, m = MI()
a = LI()

l = [i+1 for i in range(n)]

for i in range(m):
    l = [l[a[i]-1]] + l[:a[i]-1] + l[a[i]:]

print(l[0])