import strutils, sequtils

let N, A = stdin.readLine.split.map parseInt

var arr = newSeqWith(N[0], 0)
for i, v in arr: arr[i] = i + 1

for i in 0 ..< A.len:
  let k = A[i] - 1
  let v = arr[k]
  delete(arr, k)
  insert(arr, v)

echo arr[0]