https://cses.fi/paste/217ff3a030188e9e88f00/
n=int(input()) try: lst=list(map(int,input().split())) lst.sort() for i in range(1,n+1): if lst[i-1]!=i: print(i) break except: print(n)
https://cses.fi/paste/217ff3a030188e9e88f00/
n=int(input()) try: lst=list(map(int,input().split())) lst.sort() for i in range(1,n+1): if lst[i-1]!=i: print(i) break except: print(n)